a function word that is used in place of a noun or noun phrase

a personal pronoun compounded with -self to show the agent's action affects the agent

a pronoun used by the speaker to refer to or talk about himself or herself, either alone (first person singular) or together with others (first person plural).

a pronoun used when referring to or describing the individual or individuals being addressed.

a pronoun used in referring to anything or to anyone other than the speaker or the one or ones being addressed.