navy man vs military personnel

navy man and military personnel both are nouns.

Word	Noun	Adjective	Verb	Adverb
navy man	Yes	No	No	No
military personnel	Yes	No	No	No

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

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

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

navy man (noun)	military personnel (noun)
a serviceman in the navy	soldiers collectively
	someone who serves in the armed forces; a member of a military force