redfish vs red drum

redfish and red drum both are nouns.

Word	Noun	Adjective	Verb	Adverb
redfish	Yes	No	No	No
red drum	Yes	No	No	No

As nouns, redfish and red drum are synonyms defined as:

redfish and red drum: large edible fish found off coast of United States from Massachusetts to Mexico

Other synonyms of redfish include channel bass, Sciaenops ocellatus.

redfish (noun)	red drum (noun)
male salmon that has recently spawned	large edible fish found off coast of United States from Massachusetts to Mexico
large edible fish found off coast of United States from Massachusetts to Mexico
North Atlantic rockfish