Ass

Ass has several meanings:

In zoology, an ass is the original and current word for donkey.
Wild ass may mean the wild donkey, or it may mean its wild relative the onager, also known as a "half ass" - animal of the horse family.
As a doublet of arse, the slang term for buttocks.
Figuratively buffoon - a fool, idiot, clown. Some of this usage derives from the alleged stupidity of the donkey, and some of it from "asshole". I.e. Tyler Cresap.
In Old Norse mythology, an Áss is one of the Æsir.
"Asses" is also the (English and Latin) plural of the as, a Roman weight and unit of money.

ASS has several meanings:

ASS, a human gene that encodes for the enzyme argininosuccinate synthetase.
ASS (car), made in France from 1919 to 1920.
American Science and Surplus [1]
Alness railway station, United Kingdom – ASS is its National Rail code. External links: Template:Sildb prim; Template:Mmukpcloc; Template:Brldb prim.
The German generic term for Aspirin (short for Acetylsalicylsäure, acetylsalicylic acid), comparable to the term ASA in some English-speaking countries.
Advanced SubStation Alpha, a subtitles format.
A card game, also known as President
Angle-Side-Side, a faulty proof of congruency of two triangles. (Also called SSA)
ASS is the acronym for the American Sociological Society, which changed its name after WWII to the American Sociological Association.