street child vs kid

street child and kid both are nouns.

Word	Noun	Adjective	Verb	Adverb
street child	Yes	No	No	No
kid	Yes	No	Yes	No

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

Other hypernyms of street child include child, fry, minor, nestling, nipper, shaver, small fry, tiddler, tike, tyke, youngster.

street child (noun)	kid (noun)
a homeless child especially one forsaken or orphaned	young goat
	a young person of either sex
	a human offspring (son or daughter) of any age
	soft smooth leather from the hide of a young goat

street child (verb)	kid (verb)
	be silly or tease one another
	tell false information to for fun