stumbler vs walker

stumbler and walker both are nouns.

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

As nouns, walker is a hypernym of stumbler; that is, walker is a word with a broader meaning than stumbler:

Other hypernyms of stumbler include footer, pedestrian.

stumbler (noun)	walker (noun)
a walker or runner who trips and almost falls	an enclosing framework on casters or wheels; helps babies learn to walk
someone who makes mistakes because of incompetence	a light enclosing framework (trade name Zimmer) with rubber castors or wheels and handles; helps invalids or the handicapped or the aged to walk
	a shoe designed for comfortable walking
	a person who travels by foot