Heavy rain is a term used to describe a large amount of precipitation that falls in a short period of time. DOWNPOUR is an 8 letter term for heavy rain, which is defined as a sudden and intense rainfall. SPATE is a 5 letter term for heavy rain, which is defined as a sudden and large amount of something. BARRAGE is a 7 letter term for heavy rain, which is defined as a large number of things happening at the same time. STORM is a 5 letter term for heavy rain, which is defined as a violent weather event with strong winds and rain. Soaker is a 6 letter term for heavy rain, which is defined as a heavy and prolonged rainfall. GULLYWASHER is an 11 letter term for heavy rain, which is defined as a heavy and prolonged DOWNPOUR.