street-walk vs prostitute

street-walk is not a noun while prostitute is a noun.

Word	Noun	Adjective	Verb	Adverb
street-walk	No	No	Yes	No
prostitute	Yes	No	Yes	No

As verbs, prostitute is a hypernym of street-walk; that is, prostitute is a word with a broader meaning than street-walk:

street-walk (noun)	prostitute (noun)
	a woman who engages in sexual intercourse for money

street-walk (verb)	prostitute (verb)
walk the streets in search of customers	sell one's body; exchange sex for money