Although warranty and guarantee have similar meanings they cannot be used interchangeably.
Dictionary.com defines warranty and guarantee as follows:
A warranty is “a promise or guarantee given.” A warranty is usually a written guarantee for a product, and it holds the maker of the product responsible to repair or replace a defective product or its parts. It is only used as a noun.
A guarantee is the promise included in the formal (and legal) warranty.
Unless we are talking about a money-back guarantee, Dragoman prefers translating the Turkish word garanti into English not as guarantee but as warranty.