fighter vs protector

fighter and protector both are nouns.

Word	Noun	Adjective	Verb	Adverb
fighter	Yes	No	No	No
protector	Yes	No	No	No

As nouns, protector is a hypernym of fighter; that is, protector is a word with a broader meaning than fighter:

Other hypernyms of fighter include defender, guardian, shielder.

fighter (noun)	protector (noun)
a high-speed military or naval airplane designed to destroy enemy aircraft in the air	a person who cares for persons or property
someone who fights (or is fighting)
someone who fights for a cause