heat up vs bake

heat up and bake both are verbs.

Word	Noun	Adjective	Verb	Adverb
heat up	No	No	Yes	No
bake	No	No	Yes	No

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

Other hyponyms of heat up include crisp, crispen, toast, scald, soak, calcine, preheat, overheat, scorch, sear, broil, reheat.

heat up (verb)	bake (verb)
make hot or hotter	cook and make edible by putting in a hot oven
gain heat or get hot	heat by a natural force
make more intense	prepare with dry heat in an oven
	be very hot, due to hot weather or exposure to the sun