fire up vs ignite

fire up and ignite both are verbs.

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

As verbs, ignite is a hypernym of fire up; that is, ignite is a word with a broader meaning than fire up:

Other hypernyms of fire up include light.

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

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

fire up (verb)	ignite (verb)
begin to smoke	start or maintain a fire in
arouse or excite feelings and passions	arouse or excite feelings and passions
	cause to start burning; subject to fire or great heat
	start to burn or burst into flames