No, unfortunately you cannot use Amazon Rewards on Zappos. Amazon Rewards are a type of currency that can only be used to purchase products from Amazon and from select other retailers who participate in the Amazon Rewards program. Zappos does not participate in this program.
If you want to save money on Zappos, you should consider using any discount codes, coupons, or special offers that are available. You can find these offers on the Zappos website, as well as on other deal websites like Groupon and RetailMeNot. Additionally, they usually offer free shipping and free returns on orders. You can also join their rewards program which gives you points that can be used towards discounts, free shipping, and other benefits! You can learn more about their rewards program here: https://www.zappos.com/rewards.