feedback circuit vs feedback loop

feedback circuit and feedback loop both are nouns.

Word	Noun	Adjective	Verb	Adverb
feedback circuit	Yes	No	No	No
feedback loop	Yes	No	No	No

As nouns, feedback circuit and feedback loop are synonyms defined as:

feedback circuit and feedback loop: a circuit that feeds back some of the output to the input of a system

feedback circuit (noun)	feedback loop (noun)
a circuit that feeds back some of the output to the input of a system	a circuit that feeds back some of the output to the input of a system