ass vs nookie

ass and nookie both are nouns.

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

As nouns, ass and nookie are synonyms defined as:

ass (noun)	nookie (noun)
slang for sexual intercourse	slang for sexual intercourse
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