ranger vs military personnel

ranger and military personnel both are nouns.

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

As nouns, military personnel is a hypernym of ranger; that is, military personnel 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 personnel: someone who serves in the armed forces; a member of a military force

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

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