reinforcer vs stimulus

reinforcer and stimulus both are nouns.

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

As nouns, stimulus is a hypernym of reinforcer; that is, stimulus is a word with a broader meaning than reinforcer:

reinforcer: (psychology) a stimulus that strengthens or weakens the behavior that produced it
stimulus: any stimulating information or event; acts to arouse action

Other hypernyms of reinforcer include input, stimulant, stimulation.

reinforcer (noun)	stimulus (noun)
(psychology) a stimulus that strengthens or weakens the behavior that produced it	any stimulating information or event; acts to arouse action