marching vs lockstep

marching and lockstep both are nouns.

Word	Noun	Adjective	Verb	Adverb
marching	Yes	No	No	No
lockstep	Yes	No	No	No

As nouns, lockstep is a hyponym of marching; that is, lockstep is a word with a more specific, narrower meaning than marching:

marching: the act of marching; walking with regular steps (especially in a procession of some kind)
lockstep: a manner of marching in file in which each person's leg moves with and behind the corresponding leg of the person ahead

Other hyponyms of marching include countermarch, goose step, promenade, quick march, routemarch.

marching (noun)	lockstep (noun)
the act of marching; walking with regular steps (especially in a procession of some kind)	a manner of marching in file in which each person's leg moves with and behind the corresponding leg of the person ahead
	a standard procedure that is followed mindlessly