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