"Op" is a common abbreviation used for the word "operation." However, there are various synonyms available for this term that can be used to express the same meaning in different contexts. For instance, "procedure," "process," "technique," "method," and "approach" can all be used interchangeably with "operation" depending on the situation. These synonyms can be used to describe medical treatments, mechanical operations, and more. In addition, "op" can also be used as a shorthand term for "opportunity" or "option." Synonyms such as "choice," "alternative," "prospect," and "possibility" can be used to replace these meanings of "op".