stimulate vs frighten

stimulate and frighten both are verbs.

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

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

stimulate (verb)	frighten (verb)
cause to be alert and energetic	cause fear in
act as a stimulant
provide the needed stimulus for
cause to do; cause to act in a specified manner
cause to occur rapidly
stir the feelings, emotions, or peace of
stir feelings in