The main collective noun for Oysters is a bed. This term is derived from the fact that Oysters are often found in beds on the ocean floor. Other collective nouns for Oysters include a hive, a cluster, and a drift.
The term ‘bed’ is thought to have originated from the Middle English word ‘bedde’, which was used to describe a place where something was grown or cultivated. This is likely due to the fact that Oysters are often found in beds on the ocean floor, where they can grow and cultivate.