fuel vs stimulate

fuel is a noun but stimulate is not a noun.

Word	Noun	Adjective	Verb	Adverb
fuel	Yes	No	Yes	No
stimulate	No	No	Yes	No

As verbs, stimulate is a hypernym of fuel; that is, stimulate is a word with a broader meaning than fuel:

Other hypernyms of fuel include excite, shake, shake up, stir.

fuel (noun)	stimulate (noun)
a substance that can be consumed to produce energy

fuel (verb)	stimulate (verb)
stimulate	cause to be alert and energetic
provide with a combustible substance that provides energy	act as a stimulant
provide with fuel	provide the needed stimulus for
take in fuel, as of a ship	cause to do; cause to act in a specified manner
	cause to occur rapidly
	stir the feelings, emotions, or peace of
	stir feelings in