staging vs throwing away

staging and throwing away both are nouns.

Word	Noun	Adjective	Verb	Adverb
staging	Yes	No	No	No
throwing away	Yes	No	No	No

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

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

Other hypernyms of staging include discard.

staging (noun)	throwing away (noun)
travel by stagecoach	getting rid of something that is regarded as useless or undesirable
getting rid of a stage of a multistage rocket
a system of scaffolds
the production of a drama on the stage