someone who says that they do not approve of someone or something

Her critics say she is leading the party to disaster. 批评她的人说她在把该党引向灾难。

He's his own worst critic (= he judges himself severely). 他对自己要求非常严格。

someone whose job is to give their opinion about something, especially films, books, music, etc.

She's a film/theatre critic for the "Irish Times". 她是《爱尔兰时报》的一位电影／戏剧评论员。

The play has been well received by the critics. 该剧赢得了评论家们的赞誉。