heat vs fire up

heat is a noun but fire up is not a noun.

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

As verbs, heat and fire up are synonyms defined as:

Other synonyms of heat include ignite, inflame, stir up, wake.

heat (noun)	fire up (noun)
utility to warm a building
the presence of heat
the trait of being intensely emotional
the sensation caused by heat energy
a preliminary race in which the winner advances to a more important race
a form of energy that is transferred by a difference in temperature
applies to nonhuman mammals: a state or period of heightened sexual arousal and activity

heat (verb)	fire up (verb)
gain heat or get hot	begin to smoke
make hot or hotter	arouse or excite feelings and passions
arouse or excite feelings and passions
provide with heat