mass noun vs noun

mass noun and noun both are nouns.

Word	Noun	Adjective	Verb	Adverb
mass noun	Yes	No	No	No
noun	Yes	No	No	No

As nouns, noun is a hypernym of mass noun; that is, noun is a word with a broader meaning than mass noun:

mass noun: a noun that does not form plurals
noun: a content word that can be used to refer to a person, place, thing, quality, or action

mass noun (noun)	noun (noun)
a noun that does not form plurals	a content word that can be used to refer to a person, place, thing, quality, or action
	the word class that can serve as the subject or object of a verb, the object of a preposition, or in apposition