Redfish and Red drum

Redfish noun - Large edible fish found off coast of United States from Massachusetts to Mexico.

Red drum is a synonym for redfish. In some cases you can use "Red drum" instead a noun "Redfish".

Red drum noun - Large edible fish found off coast of United States from Massachusetts to Mexico.

Redfish is a synonym for red drum. You can use "Redfish" instead a noun phrase "Red drum".