eat up vs devour

eat up and devour both are verbs.

Word	Noun	Adjective	Verb	Adverb
eat up	No	No	Yes	No
devour	No	No	Yes	No

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

Other hyponyms of eat up include put away, tuck away, tuck in, consume, demolish, down, go through.

eat up (verb)	devour (verb)
finish eating all the food on one's plate or on the table	eat greedily
use up (resources or materials)	eat up completely, as with great appetite
enclose or envelop completely, as if by swallowing	to consume
	enjoy avidly