Is pain a common noun or a proper noun or a collective noun or an abstract noun?

The noun "pain" is a common noun, a general word an unpleasant physical sensation or emotional distress; a word for any pain of any kind.
A proper noun is the name or title of a specific person, place, or thing; for example, Advanced Pain Management (clinic) in Miami Shores, FL or "The Ministry of Pain: A Novel" by Dubravka Ugresic.

The noun "pain" is not a collective noun. A collective noun is a noun used to group people or things in a descriptive way; for example, a series of pains or a cluster of pains.

The noun "pain" is an abstract noun as a word for emotional distress; a word for an emotion.
The noun "pain" is a concrete noun as a word for an unpleasant physical sensation; a word for a physical thing.

Note: The plural noun 'pains' is also a common, abstract noun as a word for great care or effort; a word for a thing.

The word 'pain' is also a verb: pain, pains, paining, pained.