burn up vs burn down

burn up and burn down both are verbs.

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

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

burn up and burn down: burn completely; be consumed or destroyed by fire

Other synonyms of burn up include go up.

burn up (verb)	burn down (verb)
burn completely; be consumed or destroyed by fire	burn completely; be consumed or destroyed by fire
use up (energy)	destroy by fire
burn brightly