rain

(noun) water falling in drops from vapor condensed in the atmosphere. Synonyms: rainfall.

(noun) drops of fresh water that fall as precipitation from clouds. Synonyms: rainwater.

(noun) anything happening rapidly or in quick successive. Synonyms: pelting. Examples: "A rain of bullets." "A pelting of insults."

(verb) precipitate as rain. Synonyms: rain down. Example: "If it rains much more, we can expect some flooding."