シャチ (鯱)

I felt that I already knew this word but it didnt come easily to my mind so i am placing it here. This is "orca (killer whale)" which is cool. (bonus points!! 'Narwhal' is predictably イッカク and 'white whale' is oddly シロイルカ and also 'blue whale' joins the party as the also odd シロナガスクジラ)