grenade thrower vs marcher

grenade thrower and marcher both are nouns.

Word	Noun	Adjective	Verb	Adverb
grenade thrower	Yes	No	No	No
marcher	Yes	No	No	No

As nouns, marcher is a hypernym of grenade thrower; that is, marcher is a word with a broader meaning than grenade thrower:

Other hypernyms of grenade thrower include foot soldier, footslogger, infantryman.

grenade thrower (noun)	marcher (noun)
an infantryman equipped with grenades	fights on foot with small arms
	walks with regular or stately step
	an inhabitant of a border district