kiddy vs small fry

kiddy and small fry both are nouns.

Word	Noun	Adjective	Verb	Adverb
kiddy	Yes	No	No	No
small fry	Yes	No	No	No

As nouns, small fry is a hypernym of kiddy; that is, small fry is a word with a broader meaning than kiddy:

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

kiddy (noun)	small fry (noun)
informal term for a young child	someone who is small and insignificant
	a young person of either sex