street child vs minor

street child and minor both are nouns.

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

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

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

street child (noun)	minor (noun)
a homeless child especially one forsaken or orphaned	a young person of either sex

street child (adjective)	minor (adjective)
	inferior in number or size or amount
	lesser in scope or effect
	not of legal age
	(of a scale or mode) having half steps between the second and third degrees, and (usually) the fifth and sixth degrees, and the seventh and eighth degrees
	of your secondary field of academic concentration or specialization
	of lesser importance or stature or rank
	of lesser seriousness or danger
	of the younger of two boys with the same family name
	relatively moderate, limited, or small
	warranting only temporal punishment

street child (verb)	minor (verb)
	have as one's secondary field of study