kid vs buster

kid and buster both are nouns.

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

As nouns, buster is a hyponym of kid; that is, buster is a word with a more specific, narrower meaning than kid:

kid (noun)	buster (noun)
young goat	a person (or thing) that breaks up or overpowers something
a young person of either sex	a person who breaks horses
a human offspring (son or daughter) of any age	a robust child
soft smooth leather from the hide of a young goat	an informal form of address for a man
	a person born in the generation following the baby boom when the birth rate fell dramatically

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