silly vs small fry

silly and small fry both are nouns.

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

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

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

silly (noun)	small fry (noun)
a word used for misbehaving children	someone who is small and insignificant
	a young person of either sex

silly (adjective)	small fry (adjective)
dazed from or as if from repeated blows
ludicrous, foolish
lacking seriousness; given to frivolity
inspiring scornful pity