positive reinforcing stimulus vs positive reinforcer

positive reinforcing stimulus and positive reinforcer both are nouns.

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

As nouns, positive reinforcing stimulus and positive reinforcer are synonyms defined as:

positive reinforcing stimulus and positive reinforcer: a reinforcing stimulus that serves to increase the likelihood of the response that produces it

positive reinforcing stimulus (noun)	positive reinforcer (noun)
a reinforcing stimulus that serves to increase the likelihood of the response that produces it	a reinforcing stimulus that serves to increase the likelihood of the response that produces it