what are collivet noun

There is a spelling error in the question that you asked. Considering the question to be based on 'collective noun', answer has been provided below:

A collective noun is a name used for a number of persons or things spoken of as one whole. For example:

The Police arrested the thief. (A collection of administrative people)

The Army was sent for rescue. (A collection of soldiers)

The crowd was out of control. (A collection of people)