NREM vs nonrapid eye movement sleep

NREM and nonrapid eye movement sleep both are nouns.

Word	Noun	Adjective	Verb	Adverb
NREM	Yes	No	No	No
nonrapid eye movement sleep	Yes	No	No	No

As nouns, NREM and nonrapid eye movement sleep are synonyms defined as:

NREM and nonrapid eye movement sleep: a recurring sleep state during which rapid eye movements do not occur and dreaming does not occur; accounts for about 75% of normal sleep time

Other synonyms of NREM include nonrapid eye movement, NREM sleep, orthodox sleep.

NREM (noun)	nonrapid eye movement sleep (noun)
a recurring sleep state during which rapid eye movements do not occur and dreaming does not occur; accounts for about 75% of normal sleep time	a recurring sleep state during which rapid eye movements do not occur and dreaming does not occur; accounts for about 75% of normal sleep time