SEAL vs bluejacket

SEAL and bluejacket both are nouns.

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

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

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

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

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