There is really no completely right answer to this question. Some people say there are only 5 major types of biomes: aquatic, desert, forest, grassland, and tundra. Others split biomes further. Forests are separated into rainforest, temperate forest, chaparral, and taiga; grasslands are divided into savanna and temperate grasslands; and the aquatic biome is split into freshwater and marine.
Yes its correct there is not clarity but as said universally 5 biomes are accepted. Forest biome sometimes splits in rainforest, temperate, alpine etc but as such Forest is a biome similarly other aquatic, desert, grassland, tundra.