negative feedback vs feedback

negative feedback and feedback both are nouns.

Word	Noun	Adjective	Verb	Adverb
negative feedback	Yes	No	No	No
feedback	Yes	No	No	No

As nouns, feedback is a hypernym of negative feedback; that is, feedback is a word with a broader meaning than negative feedback:

negative feedback: feedback in opposite phase with (decreasing) the input
feedback: the process in which part of the output of a system is returned to its input in order to regulate its further output

negative feedback (noun)	feedback (noun)
feedback in opposite phase with (decreasing) the input	response to an inquiry or experiment
	the process in which part of the output of a system is returned to its input in order to regulate its further output