military machine vs echelon

military machine and echelon both are nouns.

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

military 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