I think the term is used for either a rock bass or a warmouth.
The warmouth, usually pronounced "warm mouth" instead or "war mouth" in my area, is in the same genus as bluegill. The scientific name is Lepomis gulosus. The leading edge of the anal fin usually has three spines.
The rock bass, Ambloplites rupestris, usually has several more spines on the leading edge of the anal fin.
Regards,
Ed
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