fighter vs war machine

fighter and war machine both are nouns.

Word	Noun	Adjective	Verb	Adverb
fighter	Yes	No	No	No
war machine	Yes	No	No	No

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