pedestrian vs walker

pedestrian and walker both are nouns.

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

As nouns, pedestrian and walker are synonyms defined as:

Other synonyms of pedestrian include footer.

pedestrian (noun)	walker (noun)
a person who travels by foot	an enclosing framework on casters or wheels; helps babies learn to walk
	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

pedestrian (adjective)	walker (adjective)
lacking wit or imagination