kindergartner vs shaver

kindergartner and shaver both are nouns.

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

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

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

kindergartner (noun)	shaver (noun)
a child who attends a preschool or kindergarten	a razor powered by an electric motor
	a young person of either sex
	an adult male who shaves