Is collection common noun or collective noun?

"Collection" can be both a common noun and a collective noun, depending on the context.

Here's how:

Common noun: When "collection" refers to a general group of things, it's a common noun.

* Example: "I have a large collection of stamps." Here, "collection" simply means a group of stamps.

Collective noun: When "collection" refers to a group of things considered as a single unit, it's a collective noun.

* Example: "The collection was on display at the museum." Here, "collection" refers to the whole group of items as a single entity, like a unit or exhibit.

So, it depends on the specific usage and the intended meaning!