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