combat pilot vs strafer

combat pilot and strafer both are nouns.

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

As nouns, strafer is a hyponym of combat pilot; that is, strafer is a word with a more specific, narrower meaning than combat pilot:

combat pilot: airplane pilot who fights in an action between two military forces
strafer: a combat pilot who strafes the enemy

Other hyponyms of combat pilot include fighter pilot.

combat pilot (noun)	strafer (noun)
airplane pilot who fights in an action between two military forces	a combat pilot who strafes the enemy