street child vs tyke

street child and tyke both are nouns.

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

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

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

street child (noun)	tyke (noun)
a homeless child especially one forsaken or orphaned	a young person of either sex
	a crude uncouth ill-bred person lacking culture or refinement