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