is a specific kind of: malacopterygian, soft-finned fish.

is a broader term that covers: cod, codfish | Gadus merlangus, Merlangus merlangus, whiting | haddock, Melanogrammus aeglefinus | Pollachius pollachius, pollack, pollock | hake | ling, Molva molva | Brosme brosme, cusk, torsk | grenadier, rattail, rattail fish.

is a member of: family Gadidae, Gadidae.