1. Fy
   So
2. Ok
   Ox

An ox is a single domesticated bovine, raised for meat and dairy purposes. The plural is oxen, and there are more than a billion of them in the world. America alone goes through more than 30 million cows a year.

1. Lo, be, re, fa, lo, ta, da
   Da, de, do, re, fa, mi, to
2. Do, re, mi, fa, sol, la, ti
   Ro, mi, fa, so, la, ti, to

The musical scale is essential to reading and writing music, and our Western system of mostly two-letter words has been in use for hundreds of years. Solfege, or solfeggio, is any vocal scale with syllables assigned, as in "do, re, mi ... "

1. Jo
   Je
2. Re
   Ti

The word "jo" dates back all the way to the 1500s, and it's mostly used in Scotland to address someone. It can also be used as a shortened version of the word "joy," but it is mostly used to mean "dear" or "sweetheart."

1. Te
   By
2. Wo
   A'a

A'a is pronounced "ah-ah," and it's a type of lava that forms from a fast flow. Another common type of lava is pahoehoe, which is distinguished by its smooth and ropy surface. Pillow lava forms during underwater eruptions.

1. Chile
   Iran
2. Japan
   Vietnam

The official currency of Vietnam is the dong, and a xu is 1/100th of a dong. The xu is no longer used, however. The U.S. dollar is often used in Vietnam — the dong is pegged to the U.S. dollar, so prices in Vietnam are often quoted in USD.

1. Pi
   Qi
2. Lo
   A'a

Practicing yoga, feng shui, tai chi, acupuncture or meditation is a good way to balance your qi, which is the undefinable entity within all living things that separates us from nonliving things. "Qi" is also a great word for Scrabble, if you don't have a U tile.

1. Ja
   Si
2. Ay
   Ny

The word "yes" is expressed via many two-letter words around the world. In German, Dutch and Danish, the word is "ja." Russians say, "da." In Italy or Spain, "yes" is "si." And in Korea, it is "ye."

1. Re
   Ti
2. We
   Zu

The pronoun "we" refers to the speaker plus one or more others. When it's substituted for the word "you," though, it's seen as condescending. "How did we do that?" isn't friendlier than "How did you do that?" Also, it's not to be confused with "wee," which means little.

1. Be
   Ba
2. Wo
   Gi

A gi is the typical "karate uniform" when you think of a karate uniform. It includes a baggy top and pants that are held with a belt called an obi. The color of the obi represents the martial artist's skill level. The highest attainable level is usually a black belt.

1. Ug
   He
2. Um
   Si

"Um" was first recorded in the 1600s, but it was likely in use ever since people were first able to talk. It's a filler word that expresses hesitation, and it naturally occurs in almost everyone's speech. The word "uh" can also be used to fill the silence.

1. Nu
   Xi
2. Mu
   Pi

The Greek alphabet is one of the world's earliest, differentiated from earlier alphabets by the use of both consonants and vowels. The alphabet consists of 24 letters and dates back to about 800 B.C.

1. Me
   Mi
2. Yo
   We

The word "me" is used by a speaker to refer to themselves. According to the Oxford English Dictionary, it's one of the 100 most common words in the English language, but it isn't as common as "I," "you," "he," "she" and "all."

1. Wo
   Ma
2. Ka
   Om

Ancient Egyptians went to great lengths to preserve dead royalty because they believed a human's ka could live on within a statue long after the body was dead. They believed the soul was made up of many parts, including a physical and spiritual body.

1. Be
   Si
2. Me
   Yo

"To be" is an infinitive verb that means "to exist," and being is one of the most debated topics in history. Shakespeare's famous line about being, from "Hamlet," was published in 1603 and is one of the most famous in English.

1. Ug
   Ex
2. Eh
   Oh

Your former partner may be many things, but "ex" defines them for sure. The word originated in Latin and eventually became a prefix to express a "former state," e.g., ex-girlfriend, ex-husband, etc. It then came to stand alone in the 1800s.

1. Move from place to place
   Leave
2. Attempt
   All of the above

Go is a verb, noun and adjective that means to travel or leave or to make an attempt. If someone has a "go" at the test, they attempt it. If somebody has to "go" to a test, they have to travel there, and if the test is a "go," it's functioning properly.

1. Fa
   Mi
2. Re
   Do

The word "re" is used as a preposition, but it is also known as the second note in the musical scale (do, re, mi, fa, sol, la, ti, do). As a preposition, the word is used to mean "about" or "on the subject of."

1. Ha
   Sh
2. Uh
   Ah

"Sh" is an interjection that is usually expressed with a few more Hs to tell someone to be quiet. It's an ultra abbreviated version of "shush," which means the same thing. The word "hush" is also used to demand silence.

1. Ox
   Ad
2. Ex
   Op

"Ad" is short for "advertisement," a public announcement that promotes a product or service. It's estimated that the average American is exposed to thousands of ads each day, and billions are spent creating them each year.

1. Aw
   Uh
2. Um
   Am

The word "aw" can be spelled with as many Ws as you see fit, but it's officially recognized as being spelled with one. The exclamation can be used to express sympathy, dismay, affection, pleasure, disappointment and more. It's a pretty versatile word.

1. By
   Ma
2. Do
   Pi

Pi is the circumference of a circle divided by its diameter. It's commonly expressed as 3.14, but the actual number goes on forever. Pi Day is celebrated on March 14 (3/14) every year. Pi is also the 16th letter of the Greek alphabet.

1. In
   He
2. It
   To

Science fans might recognize "He" as the symbol for helium, which is one of the most abundant elements in the universe. In the English language, the word is used as a pronoun to refer to a male or anyone who identifies as such.

1. Xu
   Or
2. Yu
   Ya

How ya doin'? "Ya" is an informal version of "you" or "your" that is hardly ever seen in written form; it's mostly spoken. When both letters are capitalized, it's an abbreviation for "young adult," as in YA novel.

1. Be
   Is
2. Do
   Am

I exist, you exist, and she exists. The word "is" is the third-person singular form of "to be," which means "to exist." The concept of existing is expressed via many words, depending on tense and number. "Am," "are," "was" and "were" are all states of existence.

1. Yu
   Oh
2. Mm
   Um

The word "mm" is more of a sound than an actual word, but it is recognized in casual conversation as an acceptable way to respond "yes" or "maybe." Whether "mm" means yes or maybe depends exclusively on the tone of voice of the speaker.

1. Oy
   Un
2. El
   Ug

The Latin for "one" is "unum," and today the word "un" has lasted to mean "one." Un can also be used as a prefix to create the opposite or reverse meaning of whatever word it is prefixing. If you are decided, you have made a decision; if you are undecided, you have not made a decision.

1. To
   On
2. In
   At

The word "at" can be used to express a specific time or place. You can meet me at Brian's house at 6 p.m. It is a preposition that has several definitions, including expressing a certain condition or the object of a thought.

1. Ox
   Ti
2. El
   Es

"El" is a noun that defines an (el)evated railroad, and Chicago's metro system is commonly known as the "L" since it is mainly above ground. NYC's metro is known as the subway because of its extensive underground system. London's metro trains run through tube-shaped tunnels.

1. So
   Lo
2. By
   In

"Lo" is an old exclamation that is almost exclusively used in the phrase "lo and behold" these days, used to preface a grand statement. It is a shortened version of the word "look" and stems from Old English.

1. In
   At
2. By
   On

The word "in" has at least a dozen meanings and can be used as almost every part of speech. It is most commonly used to describe something that is enclosed, either in abstract or physical terms. You could be in the thick of things or just in your house.

1. Yo
   Um
2. Eh
   Uh

It's a stereotype that Canadians say "eh." It comes at the end of a sentence to garner agreement, express disbelief or ask for something to be repeated. Americans also use the word, although it's usually used to express indecision. The word "meh" is used to express a lack of enthusiasm.

1. Sh
   Go
2. In
   Oh

The word "oh" might be the most versatile in the world when it comes to expressing emotions. The word can be used to express everything from indifference or sadness to ecstasy or terror. It is also one of just three words recognized as a one-letter word — "O."

1. Wo
   To
2. So
   Re

Like many two-letter words, "so" has about a dozen meanings. It's used as an adverb to add emphasis but is also commonly used as a conjunction. The word "so-so," meaning mediocre, is a different matter, consisting of four letters.

1. By
   Or
2. So
   To

The word "or" is used as a conjunction to list possibilities or choices, as opposed to the word "and," which is used as a conjunction to connect things. It's not an alternative spelling for "ore," but it is used for a few abbreviations.

1. OK
   By
2. Do
   Si

"OK" is one of the most universal words in the world because almost every language has an O, a K and a long A sound. It is also one of the weirdest words because it's often spelled in all caps, with the letters individually pronounced. "OK" or "okay" may be an abbreviation of "oll korrect" or "Old Kinderhook," depending on which expert you ask.