ass vs domestic ass

ass and domestic ass both are nouns.

Word	Noun	Adjective	Verb	Adverb
ass	Yes	No	No	No
domestic ass	Yes	No	No	No

As nouns, domestic ass is a hyponym of ass; that is, domestic ass is a word with a more specific, narrower meaning than ass:

ass: hardy and sure-footed animal smaller and with longer ears than the horse
domestic ass: domestic beast of burden descended from the African wild ass; patient but stubborn

Other hyponyms of ass include donkey, Equus asinus, jack, jackass, jennet, jenny, jenny ass, wild ass.

ass (noun)	domestic ass (noun)
slang for sexual intercourse	domestic beast of burden descended from the African wild ass; patient but stubborn
hardy and sure-footed animal smaller and with longer ears than the horse
the fleshy part of the human body that you sit on
a pompous fool