war machine vs echelon

war machine and echelon both are nouns.

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

war machine (noun)	echelon (noun)
the military forces of a nation	a diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset
	a body of troops arranged in a line
	status in a society or organization