stimulate vs fuel

stimulate is not a noun while fuel is a noun.

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

As verbs, fuel is a hyponym of stimulate; that is, fuel is a word with a more specific, narrower meaning than stimulate:

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

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