fosterling vs tyke

fosterling and tyke both are nouns.

Word	Noun	Adjective	Verb	Adverb
fosterling	Yes	No	No	No
tyke	Yes	No	No	No

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

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

fosterling (noun)	tyke (noun)
a child who is raised by foster parents	a young person of either sex
	a crude uncouth ill-bred person lacking culture or refinement