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