combat vs war machine

combat and war machine both are nouns.

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

combat (noun)	war machine (noun)
an engagement fought between two military forces	the military forces of a nation
the act of fighting; any contest or struggle

combat (verb)	war machine (verb)
battle or contend against in or as if in a battle