In favour of is an expression that signifies support or preference for someone or something. There are several synonyms for in favour of, such as supporting, endorsing, approving, advocating, championing, favoring, and promoting. These synonyms convey a similar message to in favour of and can be used interchangeably. Supporting implies aiding or helping someone in a particular action or cause, while endorsing means giving a public statement of approval. On the other hand, approving indicates a general positive opinion, while advocating connotes more active support for a particular position. Championing and favoring similarly imply a greater degree of support for a particular cause, while promoting suggests the act of encouraging or advertising. All these synonyms can convey the same meaning as in favour of, depending on the context.