Noun

• S: (n) rain, rainfall (water falling in drops from vapor condensed in the atmosphere)
• S: (n) rain, rainwater (drops of fresh water that fall as precipitation from clouds)
• S: (n) rain, pelting (anything happening rapidly or in quick successive) "a rain of bullets"; "a pelting of insults"

Verb

• S: (v) rain, rain down (precipitate as rain) "If it rains much more, we can expect some flooding"