eat vs burn up

eat and burn up both are verbs.

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

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

eat (verb)	burn up (verb)
cause to deteriorate due to the action of water, air, or an acid	burn completely; be consumed or destroyed by fire
take in solid food	use up (energy)
eat a meal; take a meal	burn brightly
take in food; used of animals only
use up (resources or materials)
worry or cause anxiety in a persistent way