This is the 8015th most frequent Russian word.
краб
Crab.
Here, 'краб' refers to the seafood item that was eaten, specifically an animal previously cooked and prepared for consumption.
На ужин я съел краба.
For dinner, I ate a crab.
In this sentence, 'краб' refers to the live sea animal observed at the zoo.
В зоопарке я увидел большого краба.
In the zoo, I saw a big crab.
Here, 'краб' metaphorically refers to a type of mechanical device resembling a crab, used for rope or cable adjustment.