ranger vs military man

ranger and military man both are nouns.

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

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

ranger: a member of a military unit trained as shock troops for hit-and-run raids
military man: someone who serves in the armed forces; a member of a military force

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

ranger (noun)	military man (noun)
an official who is responsible for managing and protecting an area of forest	someone who serves in the armed forces; a member of a military force
a member of a military unit trained as shock troops for hit-and-run raids