lockstep vs marching

lockstep and marching both are nouns.

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

As nouns, marching is a hypernym of lockstep; that is, marching is a word with a broader meaning than lockstep:

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

Other hypernyms of lockstep include march.

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