machine gunner vs military man

machine gunner and military man both are nouns.

Word	Noun	Adjective	Verb	Adverb
machine gunner	Yes	No	No	No
military man	Yes	No	No	No

As nouns, military man is a hypernym of machine gunner; that is, military man is a word with a broader meaning than machine gunner:

machine gunner: a serviceman in the artillery
military man: someone who serves in the armed forces; a member of a military force

Other hypernyms of machine gunner include man, military personnel, serviceman.

machine gunner (noun)	military man (noun)
a serviceman in the artillery	someone who serves in the armed forces; a member of a military force