Note that many of these words can function as other parts of speech too, depending on context. For example, in many disagree with his views the word "many" functions as an indefinite pronoun, while in many people disagree with his views it functions as a quantifier (a type of determiner) that qualifies the noun "people" In cases where confusion is most likely to arise, example sentences in which the word functions as an indefinite pronoun are given.
^ Some traditional grammars insist that "none" is always singular, but the plural sense is well established and widely accepted. See, for example, the COED usage note.