LMB and black bass are used interchangeably.
There are 3 common strains and a bunch of others.
Northern
Florida
F-1 is cross between Northern and Florida but not a hybrid. In theory, the F-1 combines the best of both. Some question that but they do seem to live longer and get bigger than pure Northerns. I don't think they bite as well as Northerns. Some agree with that and others don't.