touch on vs stimulate

touch on and stimulate both are verbs.

Word	Noun	Adjective	Verb	Adverb
touch on	No	No	Yes	No
stimulate	No	No	Yes	No

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

touch on (verb)	stimulate (verb)
restore by replacing a part or putting together what is torn or broken	cause to be alert and energetic
have an effect upon	act as a stimulant
refer to or discuss briefly	provide the needed stimulus for
be relevant to	cause to do; cause to act in a specified manner
	cause to occur rapidly
	stir the feelings, emotions, or peace of
	stir feelings in