There are numerous synonyms for the term "burrito filler." Some of the most commonly used ones include meat, beans, rice, cheese, vegetables, and salsa. Depending on the type of burrito you are making, you can choose any combination of these ingredients to fill your tortilla. If you're looking for a protein-packed burrito, meat and beans should be your go-to fillings. On the other hand, if you're looking for something lighter and healthier, you can fill your burrito with vegetables, rice and salsa. Cheese is a classic burrito filler that adds a delicious creamy texture to your dish. Overall, the possibilities for burrito fillers are endless, so get creative with your ingredients and enjoy!