negative reinforcing stimulus vs negative reinforcer

negative reinforcing stimulus and negative reinforcer both are nouns.

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

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

negative reinforcing stimulus and negative reinforcer: a reinforcing stimulus whose removal serves to decrease the likelihood of the response that produced it

negative reinforcing stimulus (noun)	negative reinforcer (noun)
a reinforcing stimulus whose removal serves to decrease the likelihood of the response that produced it	a reinforcing stimulus whose removal serves to decrease the likelihood of the response that produced it