Skim milk is a low-fat dairy product that is widely used in various culinary preparations. However, if you are looking for some synonyms for skim milk, then they are very few as this is a specific type of milk. Non-fat milk, fat-free milk, or even simply "milk" can be used interchangeably with skim milk, as they all contain little to no fat. Additionally, some people believe that almond milk or soy milk can be used as a replacement for skim milk, as they are also low-fat options. Overall, while there may not be many synonyms for skim milk specifically, there are plenty of low-fat or fat-free milk options available that can be used in its place.