middle watch vs night watch

middle watch and night watch both are nouns.

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

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

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

Other synonyms of middle watch include graveyard watch, midwatch.

middle watch (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.)