Diff is a common abbreviation for the word 'difference'. However, there are several synonyms for this term that can be used interchangeably to convey the same meaning. Some synonyms for diff include contrast, distinction, divergence, variance, and variation. These terms are often used to describe the difference between two things, such as two pieces of data or two concepts. Additionally, words such as discrepancy and dissimilarity can also be used when referring to a difference between two things. Using synonyms for diff can help add variety to your language and improve your writing skills by ensuring that you do not repeat the same words and phrases too often.