What is another way to say difference?

Here are some alternatives to "difference", depending on the context:

General:

* Discrepancy

* Variation

* Distinction

* Contrast

* Disparity

* Divergence

* Variance

* Dissimilarity

* Inequality

* Disagreement

More specific:

* For opinions or beliefs: divergence, dissent, disagreement

* For physical characteristics: disparity, variation, contrast, distinction

* For amounts or quantities: disparity, discrepancy, variance

* For processes or actions: divergence, variation, discrepancy

Informal:

* Gap

* Split

* Divide

* Disparity

* Spread

The best alternative will depend on the specific situation and the nuance you want to convey.