staging vs discard

staging and discard both are nouns.

Word	Noun	Adjective	Verb	Adverb
staging	Yes	No	No	No
discard	Yes	No	Yes	No

As nouns, discard is a hypernym of staging; that is, discard is a word with a broader meaning than staging:

staging: getting rid of a stage of a multistage rocket
discard: getting rid of something that is regarded as useless or undesirable

Other hypernyms of staging include throwing away.

staging (noun)	discard (noun)
travel by stagecoach	getting rid of something that is regarded as useless or undesirable
getting rid of a stage of a multistage rocket	(cards) the act of throwing out a useless card or of failing to follow suit
a system of scaffolds	anything that is cast aside or discarded
the production of a drama on the stage

staging (verb)	discard (verb)
	throw or cast away