What type of noun is mob?

The noun mob is a singular, common, concrete noun; a Word for a large crowd of people, often disorderly and intent on causing trouble.

The noun mob is also used as a collective noun, for example:

• a mob of deer
• a mob of emus
• a mob of kangaroos
• a mob of Meerkats
• a mob of whales
• a mob of wallabies