Quick definitions from WordNet (rain)

▸ noun:  anything happening rapidly or in quick successive ("A rain of bullets")
▸ noun:  water falling in drops from vapor condensed in the atmosphere
▸ noun:  drops of fresh water that fall as precipitation from clouds
▸ verb:  precipitate as rain ("If it rains much more, we can expect some flooding")
▸ name:  A surname (very rare: popularity rank in the U.S.: #20012)

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▸ Also see rain