marcher vs foot soldier

marcher and foot soldier both are nouns.

Word	Noun	Adjective	Verb	Adverb
marcher	Yes	No	No	No
foot soldier	Yes	No	No	No

As nouns, marcher and foot soldier are synonyms defined as:

Other synonyms of marcher include footslogger, infantryman.

marcher (noun)	foot soldier (noun)
fights on foot with small arms	fights on foot with small arms
walks with regular or stately step	an assistant subject to the authority or control of another
an inhabitant of a border district