buster vs baby buster

buster and baby buster both are nouns.

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

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

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

buster (noun)	baby buster (noun)
a person (or thing) that breaks up or overpowers something	a person born in the generation following the baby boom when the birth rate fell dramatically
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