small fry vs kid

small fry and kid both are nouns.

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

As nouns, small fry and kid are synonyms defined as:

Other synonyms of small fry include child, fry, minor, nestling, nipper, shaver, tiddler, tike, tyke, youngster.

small fry (noun)	kid (noun)
someone who is small and insignificant	young goat
a young person of either sex	a young person of either sex
	a human offspring (son or daughter) of any age
	soft smooth leather from the hide of a young goat

small fry (verb)	kid (verb)
	be silly or tease one another
	tell false information to for fun