sex activity vs bum

sex activity and bum both are nouns.

Word	Noun	Adjective	Verb	Adverb
sex activity	Yes	No	No	No
bum	Yes	Yes	Yes	No

sex activity (noun)	bum (noun)
activities associated with sexual intercourse	the fleshy part of the human body that you sit on
	a vagrant
	a person who is deemed to be despicable or contemptible
	person who does no work

sex activity (adjective)	bum (adjective)
	of very poor quality; flimsy

sex activity (verb)	bum (verb)
	ask for and get free; be a parasite
	be lazy or idle