NREM sleep vs orthodox sleep

NREM sleep and orthodox sleep both are nouns.

Word	Noun	Adjective	Verb	Adverb
NREM sleep	Yes	No	No	No
orthodox sleep	Yes	No	No	No

As nouns, NREM sleep and orthodox sleep are synonyms defined as:

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

NREM sleep (noun)	orthodox 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