For example, I've heard nonsenses, but I've never heard bullshits.
Why one is plural and the other is singular? They mean the same thing.
From the perspective of a plural of bullshit
It is so because bullshit is considered to be uncountable. [reference link]
But also consider this that there exists a word bullshits:
Bullshits >> Third-person singular simple present indicative form of bullshit. [reference link]
Read this article in order to have a grasp of nouns which can be either countable or uncountable.
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