polish off vs devour

polish off and devour both are verbs.

Word	Noun	Adjective	Verb	Adverb
polish off	No	No	Yes	No
devour	No	No	Yes	No

As verbs, devour is a hyponym of polish off; that is, devour is a word with a more specific, narrower meaning than polish off:

Other hyponyms of polish off include put away, tuck away, tuck in, consume, demolish, down, go through.

polish off (verb)	devour (verb)
finish a task completely	eat greedily
finish eating all the food on one's plate or on the table	eat up completely, as with great appetite
kill intentionally and with premeditation	to consume
	enjoy avidly