walker vs stroller

walker and stroller both are nouns.

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

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

walker (noun)	stroller (noun)
an enclosing framework on casters or wheels; helps babies learn to walk	a small vehicle with four wheels in which a baby or child is pushed around
a light enclosing framework (trade name Zimmer) with rubber castors or wheels and handles; helps invalids or the handicapped or the aged to walk	someone who walks at a leisurely pace
a shoe designed for comfortable walking
a person who travels by foot