Does Massacre Have Plural?

The plural form of massacre; more than one (kind of) massacre.

Is lists plural or singular?

The plural form of list is lists.

Is inspire singular or plural?

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