rainfall [rainfalls](amount of rain that falls on a single occasion) noun [UK: ˈreɪn.fɔːl] [US: ˈreɪn.ˌfɒl]
shower [showers](brief fall of rain) noun [UK: ˈʃaʊə(r)] [US: ˈʃaʊər]I had not gone very far when I was caught in a shower. = Non avevo fatto molta strada quando sono stato sorpreso da un acquazzone.