"She," "it" and "who" are all examples of pronouns.

pronouns 是 pronoun 的复数形式。pronoun 由前缀 pro-（表示"代替"）和 noun（名词）组成，字面意思是"代替名词的词"，即"代词"。代词用于替代名词或名词短语，避免重复。