The word variation has many synonyms, including diversity, deviation, alteration, modification, change, discrepancy, and fluctuation. These words are used to describe the differences between things, whether it be in biology, music, or language. Diversity refers to a wide range of differences within a group or population. Deviation implies a departure from a norm or standard. Alteration suggests a change in form or structure. Modification refers to the process of making something different. Change implies a transformation or shift from one state to another. Discrepancy describes an inconsistency or difference between two things. Fluctuation pertains to a change in levels or values over time.