fighter pilot vs combat pilot

fighter pilot and combat pilot both are nouns.

Word	Noun	Adjective	Verb	Adverb
fighter pilot	Yes	No	No	No
combat pilot	Yes	No	No	No

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

fighter pilot: a military or naval pilot of fighter planes
combat pilot: airplane pilot who fights in an action between two military forces

fighter pilot (noun)	combat pilot (noun)
a military or naval pilot of fighter planes	airplane pilot who fights in an action between two military forces