baby buggy vs bassinet

baby buggy and bassinet both are nouns.

Word	Noun	Adjective	Verb	Adverb
baby buggy	Yes	No	No	No
bassinet	Yes	No	No	No

As nouns, bassinet is a hyponym of baby buggy; that is, bassinet is a word with a more specific, narrower meaning than baby buggy:

baby buggy: a small vehicle with four wheels in which a baby or child is pushed around
bassinet: a perambulator that resembles a bassinet

baby buggy (noun)	bassinet (noun)
a small vehicle with four wheels in which a baby or child is pushed around	a basket (usually hooded) used as a baby's bed
	a perambulator that resembles a bassinet