The noun discomfort can be countable or uncountable. In more general, commonly used, contexts, the plural form will also be discomfort. However, in more specific contexts, the plural form can also be discomforts e.g. in reference to various types of discomforts or a collection of discomforts.

Can happening be plural?

The plural form of happening is happenings.

Is plural a singular or plural?

In short, this means that a singular noun refers to only one person or thing and a plural noun refers to more than one person or thing. Let's look more closely at each of these two types of nouns so we can better understand the difference.