bluejacket vs SEAL

bluejacket and SEAL both are nouns.

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

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

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

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

bluejacket (noun)	SEAL (noun)
a serviceman in the navy	a member of a Naval Special Warfare unit who is trained for unconventional warfare