silly vs kid

silly and kid both are nouns.

Word	Noun	Adjective	Verb	Adverb
silly	Yes	Yes	No	No
kid	Yes	No	Yes	No

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

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

silly (noun)	kid (noun)
a word used for misbehaving children	young goat
	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

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

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