What's the plural form of pseudohistory? Here's the word you're looking for.
Answer
The noun pseudohistory can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be pseudohistory.
However, in more specific contexts, the plural form can also be pseudohistories e.g. in reference to various types of pseudohistories
or a collection of pseudohistories.
Examples
The sagas, legends, myths and histories which have been passed on orally or in written documents by ancient peoples are sometimes called pseudohistory.
