burn up vs burn off

burn up and burn off both are verbs.

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

As verbs, burn up and burn off are synonyms defined as:

Other synonyms of burn up include burn.

burn up (verb)	burn off (verb)
burn completely; be consumed or destroyed by fire	clear land of its vegetation by burning it off
use up (energy)	use up (energy)
burn brightly