Is kids a proper noun or common noun or collective noun?

The noun 'kids' is plural noun form for the singular 'kid', a word for a child or a young goat. The word kid is a common noun, a word for any kid.

A proper noun is the name of a specific person, place, or thing; for example:
  • "Diary of a Wimpy Kid" by Jeff Kinney
  • KidsStreet Learning Center (recreational center), Needham Heights, MA

A collective noun is a word for a group of people or things; for example:
  • (children) a cacophony of kids
  • (goats) a herd of goats, a tribe of goats, a trip of goats

The word 'kids' is also the third person, present, singular of the verb to kid (kids, kidding, kidded).
  • My boss often kids me that I know more about his business than he does.