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