Warmouth and Green sunfish are two different fish.
http://www.state.nj.us/dep/wms/bfbm/...eensunfish.JPG
http://www.state.nj.us/dep/wms/bfbm/...s/warmouth.jpg
If you're eating them it really doesn't matter of course but otherwise it may be helpful to be able to positively ID a fish before possibly killing the wrong species.