positive degree vs adverb

positive degree and adverb both are nouns.

Word	Noun	Adjective	Verb	Adverb
positive degree	Yes	No	No	No
adverb	Yes	No	No	No

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

positive degree: the primary form of an adjective or adverb; denotes a quality without qualification, comparison, or relation to increase or diminution
adverb: a word that modifies something other than a noun

Other hypernyms of positive degree include adjective.

positive degree (noun)	adverb (noun)
the primary form of an adjective or adverb; denotes a quality without qualification, comparison, or relation to increase or diminution	a word that modifies something other than a noun
	the word class that qualifies verbs or clauses