stimulus vs stimulation

stimulus and stimulation both are nouns.

Word	Noun	Adjective	Verb	Adverb
stimulus	Yes	No	No	No
stimulation	Yes	No	No	No

As nouns, stimulus and stimulation are synonyms defined as:

stimulus and stimulation: any stimulating information or event; acts to arouse action

Other synonyms of stimulus include input, stimulant.

stimulus (noun)	stimulation (noun)
any stimulating information or event; acts to arouse action	the act of arousing an organism to action
	mutual sexual fondling prior to sexual intercourse
	any stimulating information or event; acts to arouse action
	(physiology) the effect of a stimulus (on nerves or organs etc.)