repetition vs rhetorical device

repetition and rhetorical device both are nouns.

Word	Noun	Adjective	Verb	Adverb
repetition	Yes	No	No	No
rhetorical device	Yes	No	No	No

As nouns, rhetorical device is a hypernym of repetition; that is, rhetorical device is a word with a broader meaning than repetition:

repetition: the repeated use of the same word or word pattern as a rhetorical device
rhetorical device: a use of language that creates a literary effect (but often without regard for literal significance)

repetition (noun)	rhetorical device (noun)
the act of doing or performing again	a use of language that creates a literary effect (but often without regard for literal significance)
the repeated use of the same word or word pattern as a rhetorical device
an event that repeats