war machine vs weekend warrior

war machine and weekend warrior both are nouns.

Word	Noun	Adjective	Verb	Adverb
war machine	Yes	No	No	No
weekend warrior	Yes	No	No	No

war machine (noun)	weekend warrior (noun)
the military forces of a nation	a reservist who fulfills the military obligation on weekends
	a homeowner who acts as a contractor and tries to do major improvement projects on weekends (often without understanding the scope of the work to be done)