sleep-learning vs hypnopedia

sleep-learning and hypnopedia both are nouns.

Word	Noun	Adjective	Verb	Adverb
sleep-learning	Yes	No	No	No
hypnopedia	Yes	No	No	No

As nouns, sleep-learning and hypnopedia are synonyms defined as:

sleep-learning and hypnopedia: teaching during sleep (as by using recordings to teach a foreign language to someone who is asleep)

sleep-learning (noun)	hypnopedia (noun)
teaching during sleep (as by using recordings to teach a foreign language to someone who is asleep)	teaching during sleep (as by using recordings to teach a foreign language to someone who is asleep)