A collective noun refers to a group of people, animals or a collection of things taken as a whole.
Collective nouns examples:
What is a group of girls called? A bevy of girls, a giggle of girls
What is a group of boys called? A blush of boys, a rascal of boys
What is a group of cats called? A glaring of cats, a cluster of cats, a clutter of cats
What is a group of ferrets called? A business ferrets, a cast of ferrets
What is a group of giraffes called? A journey of giraffes, a herd of giraffes, a tower of giraffes