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