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All 101 Two-Letter Words Acceptable in the OSPD4
The five words shown with a suffixed plus sign are new in OSPD4 as of March 1, 2006.

AA  - rough, cindery lava FE+ - a Hebrew letter OM  - a mantra
AB  - abdominal muscle GO  - a Japanese board game ON  - batsman's side of wicket
AD  - advertisement HA  - sound of surprise OP  - a style of abstract art
AE  - one HE  - male person OR  - the heraldic color gold
AG  - agriculture HI  - used as a greeting OS  - a bone
AH  - to exclaim in surprise HM  - expresses consideration OW  - expresses pain
AI  - three-toed sloth HO  - expresses surprise OX  - a clumsy person
AL  - an East Indian tree ID  - part of the psyche OY  - expresses dismay
AM  - form of "to be" IF  - a possibility PA  - father
AN  - indefinite article IN  - to harvest PE  - a Hebrew letter
AR  - the letter "R" IS  - form of "to be" PI  - a Greek letter
AS  - to the same degree IT  - neuter pronoun QI+ - Chinese vital force
AT  - in the position of JO  - sweetheart RE  - a tone of the scale
AW  - expresses protest KA  - (Egyptian) spiritual self SH  - urges silence
AX  - cutting tool KI+ - qi (Chinese vital force) SI  - ti (a tone of the scale)
AY  - affirmative vote LA  - a tone of the scale SO  - sol (a tone of the scale)
BA  - (Egyptian) eternal soul LI  - Chinese unit of distance TA  - expression of gratitude
BE  - to have actuality LO  - expresses surprise TI  - a tone of the scale
BI  - a bisexual MA  - mother TO  - in the direction of
BO  - a pal ME  - personal pronoun UH  - expresses hesitation
BY  - a side issue MI  - a tone of the scale UM  - indicates hesitation
DE  - of; from - used in names MM  - expresses assent UN  - one
DO  - a tone of the scale MO  - a moment UP  - to raise
ED  - education MU  - a Greek letter US  - personal pronoun
EF  - the letter "F" MY  - possessive pronoun UT  - musical tone (is now DO)
EH  - expresses doubt NA  - no; not WE  - pronoun
EL  - elevated railroad NE  - born with the name of WO  - woe
EM  - the letter "M" NO  - a negative reply XI  - a Greek letter
EN  - the letter "N" NU  - a Greek letter XU  - monetary unit of Vietnam
ER  - expresses hesitation OD  - a hypothetical force YA  - you
ES  - the letter "S" OE  - Faeroe Islands whirlwind YE  - you
ET  - a past tense of eat OF  - coming from YO  - used to call attention
EX  - the letter "X" OH  - to exclaim in surprise ZA+ - a pizza
FA  - a tone of the scale OI+ - oy (expresses dismay)