Is internet a common noun or a collective noun?

The word 'internet' is a common noun, a word for a global electronic network connecting computers around the world.

A collective noun is a word used to group people or things taken together as one whole in a descriptive way. A collective noun is an informal part of speech. There are hundreds of nouns used as standard collective nouns, but any noun that suits the circumstances can be used as a collective noun; for example, an internet of roads, an internet of interstates, an internet of gossips, etc.