sleep-learning vs pedagogy

sleep-learning and pedagogy both are nouns.

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

As nouns, pedagogy is a hypernym of sleep-learning; that is, pedagogy is a word with a broader meaning than sleep-learning:

sleep-learning: teaching during sleep (as by using recordings to teach a foreign language to someone who is asleep)
pedagogy: the profession of a teacher

Other hypernyms of sleep-learning include instruction, teaching.

sleep-learning (noun)	pedagogy (noun)
teaching during sleep (as by using recordings to teach a foreign language to someone who is asleep)	the profession of a teacher
	the activities of educating or instructing; activities that impart knowledge or skill
	the principles and methods of instruction