stoppage vs standdown

stoppage and standdown both are nouns.

Word	Noun	Adjective	Verb	Adverb
stoppage	Yes	No	No	No
standdown	Yes	No	No	No

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

Other hyponyms of stoppage include stand-down, haemostasia, haemostasis, hemostasia, hemostasis.

stoppage (noun)	standdown (noun)
the act of stopping something	(military) a temporary stop of offensive military action
an obstruction in a pipe or tube	a suspension and relaxation from an alert state or a state of readiness
the state of inactivity following an interruption