misnomer

将这种植物称为‘仙人掌’其实是个误称，因为它属于多肉植物。

Calling this plant a '___cactus' is a ___misnomer because it's actually a succulent.

将这种饮料称为'健康果汁'其实是个误导性名称，因为它含有大量糖分。

Calling this drink 'healthy juice' is a ___misnomer since it contains a high amount of sugar.