"As a case in point" is a commonly used phrase that is often used to provide an example or proof of something. There are many synonyms that can be used in place of this phrase, including "for instance," "as an example," "like," "specifically," "namely," "to illustrate," and "to demonstrate." Each of these synonyms can be used interchangeably with "as a case in point" to provide clarity and emphasis when making a point or argument. It is important to choose the appropriate synonym based on the context and purpose of the statement to ensure effective communication and understanding.