positive feedback vs feedback

positive feedback and feedback both are nouns.

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

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

positive feedback: feedback in phase with (augmenting) 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

positive feedback (noun)	feedback (noun)
feedback in phase with (augmenting) 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