crayfish
Synonym discussion
Sense: noun/1
Crayfish usually means the small freshwater animal that looks like a tiny lobster, and it can also mean the meat from that animal when people are cooking or eating it. Crawfish is mostly a regional variant, especially in parts of the southern United States, so the meaning is usually the same but the local flavor is different. Lobster is much larger, fully marine, and strongly linked with heavy front claws. Shrimp and prawn are also smaller seafood animals, but they have a lighter, less lobster-like shape. In nature writing, crayfish belongs with rivers, lakes, mud, traps, and stones rather than open sea water.
Common collocations
Etymology
The word came into English from an older French-based name for this animal. Over time, English speakers reshaped the ending to fish because the creature lives in water and the new form sounded more familiar. The modern spelling can be misleading, though: a crayfish is a crustacean, not a fish.