1) Cloudburst 2) Deluge 3) Drenching rain 4) Driving rain 5) End of drought 6) Heavy fall of rain 7) Heavy rain shower 8) Heavy shower 9) Parade spoiler 10) Pelter 11) Rain 12) Rainfall 13) Rainstorm 14) Soaker 15) Steady rain 16) Thunderstorm phenomenon 17) Torrent 18) Torrential rain 19) Waterspout 1) Cloudburst 2) Deluge 3) Driving rain 4) Heavy rain 5) Pelter 6) Precipitation 7) Rain 8) Shower 9) Soaker 10) Storm 11) Tempest 12) Torrent 
• (n.) A pouring or streaming downwards; esp., a heavy or continuous shower.
Down'pour` noun A pouring or streaming downwards; esp., a heavy or continuous shower. 
[n] - a heavy rain
cloudburst noun a heavy rain
a heavy, drenching rain.