The ability to use all available two letter Scrabble words opens up all kinds of additional places on the board to play. Instead of being limited mostly to playing across existing words, two letter words open the chance to play words parallel to existing words forming one or multiple short words and one longer word that you are laying down.
Two letter words are also excellent for dumping extra letters at the end of the game.
Here are all the two letter Scrabble Dictionary approved words. Unlike most versions of the two letter list, I have arranged the list by type of word to make them easier to remember and help you isolate the words you may need to memorize from the common words you already know.
These are words you may not use very often or may not think are actual words (like AG and ED)
AA: noun. Plural is AAS rough cindery lava
AE: adjective meaning one
AG: adjective pertaining to agriculture in some way
AI: noun plural is AIS a three toed sloth (type of animal)
AL: noun plural is ALS a tree from East India
BA: noun plural BAS. the eternal soul in Egyptian mythology
BO: noun plural BOS. an older expression for a friend or pal, or male lover
DE: preposition meaning "of" or "from" and used in names. Common in Netherland origin names
ED: noun plural EDS. pertaining to education
EL: noun plural ELS. an elevated train, as in Chicago and other cities.
ET: a past tense of EAT
JO noun plural is JOES. Older expression for a sweetheart
KA noun plural is KAS. the spiritual self of a human being in Egyptian religion.
LI: noun plural is LIS. A Chinese unit of distance measurement
MO: noun plural is MOS. a moment.
NE: adjective meaning born with the name of. Also NEE is valid as an alternate spelling.
OD: noun with the plural ODS. a hypothetical force of natural power.
OE: noun meaning a whirlwind off the Faeroe Islands. One of the weirder words on the two letter word list and good for dumping vowels. OES is acceptable.
OP: noun and a style of abstract art. OPS is the plural.
OS: noun meaning part of the body including an orifice. Acceptable extensions include OSS, ORA, OSSA, and OSAR.
PI: verb meaning to jumble. PIED, PIEING, PIING or PIES are all valid words.
UN: pronoun meaning one. UNS is the plural
WO: noun. Another form of WOE. WOS is the plural.
XU: noun and it's own plural. A monetary unit in Vietnam
In grammar, an interjection or exclamation is a word used to express an emotion or sentiment on the part of the speaker (although most interjections have clear definitions). Filled pauses such as uh, er, um are also considered interjections. Interjections are typically placed at the beginning of a sentence.
AH: interjection used to express delight, relief or contempt
AW: interjection used to express protest, disgust, or disbelief
AY: noun plural is AYS. Saying Yes or voting in the affirmative
EH: interjection used to express doubt. Also a common Canadian expression meaning almost anything Canadians want it to mean.
ER: interjection used to express hesitation
HA: noun plural is HAS. sound of surprise or laughter/mocking
HI: interjection and a greeting
HM: interjection used to express thoughtful consideration
HO: interjection used to express surprise and used by Santa Claus as a greeting
LO: interjection used to attract attention. Popular in Christmas carols.
MM: interjection used to express agreement or satisfaction
NA: adverb meaning no or not
OH: verb meaning surprised, in pain, or desire (oh baby!) OHS, OHING, OHED are acceptable.
OW: interjection meaning sudden pain.
OY: another interjection meaning dismay or pain.
SH: interjection used to urge silence
TA: noun and an expression of gratitude. TAS is valid as the plural.
UH: interjection used to express hesitation
UM: same as UH
YA: pronoun meaning you and an expression
YE: also a pronoun meaning you.
YO: interjection used to call attention or express affirmation.
DO: noun plural is DOS
FA: noun plural is FAS
LA: noun plural is LAS
MI: noun plural is MIS
RE: noun plural is RES
SI: noun and the same as TI. Plural is SIS
SO: noun plural is SOS (yes this makes the expression SOS valid)
TI: noun and the same as SI. Plural is TIS
UT: noun that was used in the French musical scale. Replaced by DO
Letters of the Alphabet Spelled Out
AR: plural is ARS - the letter R
EF: plural is EFS - the letter F
EM: plural is EMS - the letter N
EN: plural is ENS - the letter N
ES: plural is ESES or ESS - the letter S
EX: plural is EXES - the letter X
MU: Plural is MUS and it is the name of a Greek Letter
NU: with the plural of NUS it is another Greek Letter
PE: a Hebrew Letter with the plural of PES
XI: another Greek Letter. XIS is the plural.
Other Common Words
These are not words you'll need to memorize because you use them all the time, but look at some of the unusual endings for them when used in uncommon ways.
AB noun. plural is ABS an abdominal muscle
AD noun. plural is ADS an advertisement
AM: present first person singular of BE
AN: indefinite article used before words beginning with a vowel
AS: adverb to the same degree
AT: preposition meaning in the position of
AX: verb/noun a type of cutting tool. Can extend to AXED, AXING, AXES
BE: verb meaning to have actuality. Can be extended to BEEN, BEING and many unrelated words that start in BE.
BI: noun plural BIS meaning a bisexual person
BY: in addition to the obvious meaning, BY is also a noun which means to take a pass in certain card games. Therefore BYS is a valid word.
GO: verb meaning to move along. GONE GOING, GOES are valid extensions.
HE: noun plural is HES. a male person
ID: noun plural is IDS. A part of the psyche.
IF: noun plural is IFS. a possibility
IN: verb meaning to harvest (and other meanings). INS is valid.
IS: present third person singular of BE
IT: pronoun third person singular
MA: noun plural is MAS. a mother.
ME: pronoun meaning yourself or I
MY: pronoun possessive form of pronoun I
NO: noun and a negative reply. NOES and NOS are acceptable plurals.
OF: preposition meaning coming from
ON: while it has multiple meanings , OH is also a noun referring to where a batter stands in cricket, making ONS valid.
OR: while a common word, it is also a noun referring to the color gold. ORS is acceptable because of this definition.
OX: noun. a particular type of hoofed animal. OXES and OXEN are both valid.
PA: noun meaning father. PAS is the plural.
TO: preposition meaning in the direction of.
UP: verb meaning to raise UPS is not just a package delivery service its a valid Scrabble word.
US: pronoun and very common word.
Good luck and I hope these words help you in bettering your Scrabble game.