negative reinforcer vs negative reinforcing stimulus

negative reinforcer and negative reinforcing stimulus both are nouns.

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

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

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

negative reinforcer (noun)	negative reinforcing stimulus (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