What is the core feature that unites all pronouns as a class of words, despite their lack of a common set of lexico-grammatical features?

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Their exceptional variability of reference, which allows them to replace hundreds of nouns.

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Their uniform set of morphological categories and syntactical functions.

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The fact that they all serve to replace a noun in a sentence.

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The way they denote reality, by indicating substances, qualities, or quantities, rather than naming or describing them.

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