kindergartner vs tyke

kindergartner and tyke both are nouns.

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

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

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

kindergartner (noun)	tyke (noun)
a child who attends a preschool or kindergarten	a young person of either sex
	a crude uncouth ill-bred person lacking culture or refinement