What's the plural form of cottonseed oil? Here's the word you're looking for.
Answer
The noun cottonseed oil can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be cottonseed oil.
However, in more specific contexts, the plural form can also be cottonseed oils e.g. in reference to various types of cottonseed oils
or a collection of cottonseed oils.