midwatch vs night watch

midwatch and night watch both are nouns.

Word	Noun	Adjective	Verb	Adverb
midwatch	Yes	No	No	No
night watch	Yes	No	No	No

As nouns, midwatch and night watch are synonyms defined as:

midwatch and night watch: a watch during the night (as from midnight to 8 a.m.)

Other synonyms of midwatch include graveyard watch, middle watch.

midwatch (noun)	night watch (noun)
a watch during the night (as from midnight to 8 a.m.)	a watch during the night (as from midnight to 8 a.m.)