Common names are not always accurate. For example, a killer whale is not a whale, and a civet cat is not a cat.
Common names vary by region and can refer to the same organism. Micropterus salmoides has a number of different names that it is known by in different parts of the US. These include bigmouth, black bass, brown bass, bucketmouth, Florida bass, Florida largemouth, gilsdorf bass, green bass, green trout, linesides, northern largemouth, Oswego bass, Potter's fish, southern largemouth, and widemouth bass.