sexual congress vs ass

sexual congress and ass both are nouns.

Word	Noun	Adjective	Verb	Adverb
sexual congress	Yes	No	No	No
ass	Yes	No	No	No

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

sexual congress: sexual activity between individuals, especially the insertion of a man's penis into a woman's vagina until orgasm and ejaculation occur
ass: slang for sexual intercourse

sexual congress (noun)	ass (noun)
sexual activity between individuals, especially the insertion of a man's penis into a woman's vagina until orgasm and ejaculation occur	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