The main collective noun for lobster is a risk, a word that traces back to the Old French “risque”. It first appeared in the 16th century as a way to describe a large gathering of lobsters, and it has stuck around ever since. Today you will still hear a risk used for a sizeable group of lobsters, usually the kind pulled up in a single haul. It applies just as well to a batch of lobsters being transported or sold together.
What Is a Group of Lobster Called? – Lobster Collective Nouns.
