small fry vs peanut

small fry and peanut both are nouns.

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

As nouns, peanut is a hyponym of small fry; that is, peanut is a word with a more specific, narrower meaning than small fry:

small fry (noun)	peanut (noun)
someone who is small and insignificant	pod of the peanut vine containing usually 2 nuts or seeds; `groundnut' and `monkey nut' are British terms
a young person of either sex	a young child who is small for his age
	widely cultivated American plant cultivated in tropical and warm regions; showy yellow flowers on stalks that bend over to the soil so that seed pods ripen underground
	underground pod of the peanut vine

small fry (adjective)	peanut (adjective)
	of little importance or influence or power; of minor status