foster child vs shaver

foster child and shaver both are nouns.

Word	Noun	Adjective	Verb	Adverb
foster child	Yes	No	No	No
shaver	Yes	No	No	No

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

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

foster child (noun)	shaver (noun)
a child who is raised by foster parents	a razor powered by an electric motor
	a young person of either sex
	an adult male who shaves