chiasmus vs rhetorical device

chiasmus and rhetorical device both are nouns.

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

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

chiasmus: inversion in the second of two parallel phrases
rhetorical device: a use of language that creates a literary effect (but often without regard for literal significance)

chiasmus (noun)	rhetorical device (noun)
inversion in the second of two parallel phrases	a use of language that creates a literary effect (but often without regard for literal significance)