@BillJ thanks, i think i understand theoretically the distinction between pro-forms and pronouns. my question pertains to the validity of the definition of 'pronoun' seen in various dictionaries, as answered in the negative above by other users.

@curiousdannii in that case, you disagree with the 'Pronouns vs pro-forms' table from the pronoun wiki?

@JanusBahsJacquet thank you. i have noticed in many definitions of pronoun the subtle use of 'can' or 'may', which seems to indicate exactly what you are saying.