The phrase "end of rainbow" refers to the spot where a rainbow appears to touch the ground. However, there are several other expressions that can be used to mean the same thing. Such synonyms include "pot of gold," which refers to the belief that a leprechaun's treasure can be found at the end of a rainbow. Another synonym is "rainbow's end," which is another way of describing the same spot. "Gold at the end of the rainbow" is also commonly used to describe this phenomenon. Any of these phrases can be used interchangeably to describe the magical spot where a rainbow appears to end.