walker vs marcher

walker and marcher both are nouns.

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

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

walker (noun)	marcher (noun)
an enclosing framework on casters or wheels; helps babies learn to walk	fights on foot with small arms
a light enclosing framework (trade name Zimmer) with rubber castors or wheels and handles; helps invalids or the handicapped or the aged to walk	walks with regular or stately step
a shoe designed for comfortable walking	an inhabitant of a border district
a person who travels by foot