sailor vs military man

sailor and military man both are nouns.

Word	Noun	Adjective	Verb	Adverb
sailor	Yes	No	No	No
military man	Yes	No	No	No

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

sailor: a serviceman in the navy
military man: someone who serves in the armed forces; a member of a military force

Other hypernyms of sailor include man, military personnel, serviceman.

sailor (noun)	military man (noun)
a stiff hat made of straw with a flat crown	someone who serves in the armed forces; a member of a military force
any member of a ship's crew
a serviceman in the navy