Answer : A collective noun is a term used to refer to a collection of people, animals, or objects. These are sometimes referred to as clustered nouns. The term pack is a collective noun in the phrase pack of dogs.
Here, the collective noun for a group of locusts can be a plague of locusts, a cloud of locusts, a swarm of locusts. When describing a group of locusts, simply replace the word “group” with one of the collective nouns from the words listed.