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