sailor vs SEAL

sailor and SEAL both are nouns.

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

As nouns, SEAL is a hyponym of sailor; that is, SEAL is a word with a more specific, narrower meaning than sailor:

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

Other hyponyms of sailor include coastguardsman, Navy SEAL, striker, submariner.

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