standdown vs stand-down

standdown and stand-down both are nouns.

Word	Noun	Adjective	Verb	Adverb
standdown	Yes	No	No	No
stand-down	Yes	No	No	No

As nouns, standdown and stand-down are synonyms defined as:

standdown and stand-down: (military) a temporary stop of offensive military action

As nouns, standdown and stand-down are synonyms defined as:

standdown and stand-down: a suspension and relaxation from an alert state or a state of readiness

standdown (noun)	stand-down (noun)
(military) a temporary stop of offensive military action	(military) a temporary stop of offensive military action
a suspension and relaxation from an alert state or a state of readiness	a suspension and relaxation from an alert state or a state of readiness