Homarus vulgaris, commonly known as the European lobster, is a large crustacean found in the north-east Atlantic Ocean. While the scientific name refers to a specific species, in common language, there are numerous synonyms for it. Some of the most popular synonyms for Homarus vulgaris are spiny lobster, rock lobster, and crawfish. These synonyms are generally used interchangeably and refer to different types of lobsters or crustaceans. For example, spiny lobsters are characterized by their long, spiny antennae and lack of large claws, while rock lobsters often live in rocky areas and have a spiny exoskeleton. In any case, all these synonymous terms generally describe any large, clawed crustacean of marine waters.