eat up vs spend

eat up and spend both are verbs.

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

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

eat up (verb)	spend (verb)
finish eating all the food on one's plate or on the table	pay out
use up (resources or materials)	spend completely
enclose or envelop completely, as if by swallowing	use up a period of time in a specific way