Collective nouns

A group of eagles is called an aerie.

A group of caterpillars is called an army. Sometimes a group of ants is called an army too.

A bale is a large bundle of something, usually tightly packed into a regular shape and held together with string. Hay and straw are the two most common items that is packed into bales, but wool and recyclables like cardboard can also be packed into bales.

A band is a group of musicians who perform music together. Music made by a group of people playing different instruments together is usually more interesting than music made by only a single instrument.

A batch is a large amount of the same thing meant to be grouped together. Another word for batch is bundle. You can bake a batch of cookies.