hypallage vs rhetorical device

hypallage and rhetorical device both are nouns.

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

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

hypallage: reversal of the syntactic relation of two words (as in `her beauty's face')
rhetorical device: a use of language that creates a literary effect (but often without regard for literal significance)

hypallage (noun)	rhetorical device (noun)
reversal of the syntactic relation of two words (as in `her beauty's face')	a use of language that creates a literary effect (but often without regard for literal significance)