baby buster vs buster

baby buster and buster both are nouns.

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

As nouns, baby buster and buster are synonyms defined as:

baby buster and buster: a person born in the generation following the baby boom when the birth rate fell dramatically

baby buster (noun)	buster (noun)
a person born in the generation following the baby boom when the birth rate fell dramatically	a person (or thing) that breaks up or overpowers something
	a person who breaks horses
	a robust child
	an informal form of address for a man
	a person born in the generation following the baby boom when the birth rate fell dramatically