| rival | (noun) the contestant you hope to defeat | Synonyms: challenger, competition, competitor, contender |
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| rivalry | (noun) the act of competing as for profit or a prize | Synonyms: competition, contention |
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| river | (noun) a large natural stream of water (larger than a creek) | - |
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| riverbank | (noun) the bank of a river | Synonyms: riverside |
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| riverbed | (noun) a channel occupied (or formerly occupied) by a river | Synonyms: river bottom |
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| riverside | (noun) the bank of a river | Synonyms: riverbank |
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| rivet | (noun) heavy pin having a head at one end and the other end being hammered flat after being passed through holes in the pieces that are fastened together | - |
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| (noun) ornament consisting of a circular rounded protuberance (as on a vault or shield or belt) | Synonyms: stud |
| riveter | (noun) a machine for driving rivets | Synonyms: riveting machine, rivetter |
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| (noun) a worker who inserts and hammers rivets | Synonyms: rivetter |
| rivetter | (noun) a machine for driving rivets | Synonyms: riveter, riveting machine |
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| (noun) a worker who inserts and hammers rivets | Synonyms: riveter |
| rivulet | (noun) a small stream | Synonyms: rill, run, runnel, streamlet |
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| rivulus | (noun) found in small streams of tropical America; often kept in aquariums; usually hermaphroditic | - |
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