"For heaven's sake/sakes" is an English expression that is used to express irritation, frustration, surprise, or even shock when speaking to someone. However, there are several synonyms for this expression, and these include "goodness gracious," "for Pete's sake," "holy cow," "holy smokes," "my goodness," and "lordy." These expressions carry the same meaning as "for heaven's sake/sakes" and can be used interchangeably depending on the situation or context. These synonyms are useful when conveying a sense of urgency or exasperation to someone, and they can help to convey emotion and tone in a conversation.