grenade thrower vs footslogger

grenade thrower and footslogger both are nouns.

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

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

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

grenade thrower (noun)	footslogger (noun)
an infantryman equipped with grenades	fights on foot with small arms