Navy SEAL vs sailor

Navy SEAL and sailor both are nouns.

Word	Noun	Adjective	Verb	Adverb
Navy SEAL	Yes	No	No	No
sailor	Yes	No	No	No

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

Navy SEAL: a member of a Naval Special Warfare unit who is trained for unconventional warfare
sailor: a serviceman in the navy

Other hypernyms of Navy SEAL include bluejacket, navy man, sailor boy.

Navy SEAL (noun)	sailor (noun)
a member of a Naval Special Warfare unit who is trained for unconventional warfare	a stiff hat made of straw with a flat crown
	any member of a ship's crew
	a serviceman in the navy