bum vs sexual activity

bum and sexual activity both are nouns.

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

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

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

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