Synonyms for crab

noun

1. A short-tailed or soft-tailed crustacean

   podothalmian, Brachyura, Anomura (both Latin), seafood; see shellfish.

   Kinds of crabs include: softshell, hardshell, deep-sea, king, horseshoe, blue, spider, giant spider, Japanese spider, shore, rock, land, fiddler, Dungeness, Jonah, green, pea, box, porcelain, lady, ghost, swimming, paddle, shuttle, hermit, purse.

2. A grouchy person

   complainer, grumbler, grump, bellyacher*; see grouch.