street person vs bum

street person and bum both are nouns.

Word	Noun	Adjective	Verb	Adverb
street person	Yes	No	No	No
bum	Yes	Yes	Yes	No

As nouns, bum is a hypernym of street person; that is, bum is a word with a broader meaning than street person:

Other hypernyms of street person include hobo, tramp.

street person (noun)	bum (noun)
someone who sleeps in any convenient place	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

street person (adjective)	bum (adjective)
	of very poor quality; flimsy

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