stroller vs pushchair

stroller and pushchair both are nouns.

Word	Noun	Adjective	Verb	Adverb
stroller	Yes	No	No	No
pushchair	Yes	No	No	No

As nouns, stroller and pushchair are synonyms defined as:

stroller and pushchair: a small vehicle with four wheels in which a baby or child is pushed around

Other synonyms of stroller include baby buggy, baby carriage, carriage, go-cart, perambulator, pram, pusher.

stroller (noun)	pushchair (noun)
a small vehicle with four wheels in which a baby or child is pushed around	a small vehicle with four wheels in which a baby or child is pushed around
someone who walks at a leisurely pace