nonrapid eye movement vs NREM

nonrapid eye movement and NREM both are nouns.

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

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

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

nonrapid eye movement (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