This is the 4010th most frequent Polish word.
wieloryb
Whale.
Here, 'wieloryb' is used as a general noun referring to the animal species 'whale'.
Wieloryb to największy ssak morski.
The whale is the largest marine mammal.
Here, 'wieloryba' is the accusative case of 'wieloryb,' showing that it is the direct object of the action.
W zeszłym tygodniu widzieliśmy wieloryba na wycieczce statkiem.
Last week, we saw a whale during a boat trip.
Here, 'wielorybów' is the genitive plural of 'wieloryb,' indicating possession or association.