As nouns the difference between downpour and thundershowers
is that downpour
is a heavy rain while thundershowers
As a verb downpour
is to pour down; rain heavily.
a heavy rain
- They got caught in a downpour without an umbrella and came back soaked.
* rain cats and dogs
To pour down; rain heavily.
* 2002 , Patricia Koretchuk, Chasing the comet: a Scottish-Canadian life - Page 211 :
- It started to downpour , so Billy and I made our way back to our house, with Scotty following—or so I thought.