* Deserve means to be worthy of something.
* Obtain means to get or acquire something.
* Desert (pronounced the same as "dessert") can mean a barren, dry region or to abandon someone or something.
Here are some examples:
* Deserve: "He deserves a promotion after all his hard work."
* Obtain: "She obtained a scholarship to study abroad."
* Desert: "The Sahara Desert is the largest hot desert in the world."
* Desert: "He deserted his family and disappeared."