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