Wh-pronouns (what, who, whom, whoever) are used in certain question forms, or act as complementizers (Frida, who married Diego...).

University of Michigan - Ann Arbor

Pronouns act as a shorthand for referring to an entity or event.

Pronoun

An on-going but a helpful book resource about NLP
https://web.stanford.edu/~jurafsky/slp3/

Speech and Language Processing (3rd ed. draft) 

Personal pronouns refer to persons or entities (you, she, I, it, me, etc.).

Personal pronoun

Possessive pronouns are forms of personal pronouns that indicate either actual possession or more often just an abstract relation between the person and some object (my, your, his, her, its, one’s, our, their).

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