nonrapid eye movement sleep vs NREM

nonrapid eye movement sleep and NREM both are nouns.

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

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

nonrapid eye movement sleep and NREM: 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 nonrapid eye movement sleep include nonrapid eye movement, NREM sleep, orthodox sleep.

nonrapid eye movement sleep (noun)	NREM (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