fighter vs fighter aircraft

fighter and fighter aircraft both are nouns.

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

As nouns, fighter and fighter aircraft are synonyms defined as:

fighter and fighter aircraft: a high-speed military or naval airplane designed to destroy enemy aircraft in the air

Other synonyms of fighter include attack aircraft.

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