Brazilian bikinis and thong bikinis are not exchangeable, but Brazilian bikinis fall into the category of thong bikinis. Brazilian bikini bottoms tend to offer slightly more coverage than many other styles of thong bikini bottoms. Regarding leanness, Brazilian bikini bottoms fall between cheeky bottoms and skimpier thong bikini bottoms.
However, this is not to say that Brazilian bikini bottoms are anything but modest. Brazilian bikini bottoms are very skimpy and offer minimal coverage of your back, but they are still fuller in the front and back than narrower thong-type bikini bottoms, such as G-string bottoms.