Navy SEAL vs bluejacket

Navy SEAL and bluejacket both are nouns.

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

As nouns, bluejacket is a hypernym of Navy SEAL; that is, bluejacket 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
bluejacket: a serviceman in the navy

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

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