Question

crowd,pupil,herd,swarm ​

Answer 1

Answer:

A collective noun is a word referring to a collection of things taken as a whole. Most collective nouns in everyday speech are not specific to one kind of thing, such as the word "group", which can be applied to people or dogs or other things.

Answer 2

Answer:

crowd,pupil,herd,swarm are the examples of collective nouns

hence collective nouns