| rock | (noun) pitching dangerously to one side | Synonyms: careen, sway, tilt |
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| (noun) a genre of popular music originating in the 1950s; a blend of black rhythm-and-blues with white country-and-western | Synonyms: rock-and-roll, rock'n'roll, rock 'n' roll, rock and roll, rock music |
| (noun) hard bright-colored stick candy (typically flavored with peppermint) | Synonyms: rock candy |
| (noun) a lump or mass of hard consolidated mineral matter | Synonyms: stone |
| (noun) (figurative) someone who is strong and stable and dependable | - |
| (noun) material consisting of the aggregate of minerals like those making up the Earth's crust | Synonyms: stone |
| rockabilly | (noun) a fusion of black music and country music that was popular in the 1950s; sometimes described as blues with a country beat | - |
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| rockchuck | (noun) heavy-bodied yellowish-brown marmot of rocky areas of western North America | Synonyms: Marmota flaviventris, yellowbelly marmot |
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| rockcress | (noun) any of several rock-loving cresses of the genus Arabis | Synonyms: rock cress |
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| (noun) noxious cress with yellow flowers; sometimes placed in genus Sisymbrium | Synonyms: Barbarea vulgaris, rocket cress, Sisymbrium barbarea, yellow rocket |
| rocker | (noun) a curved support that permits the supported object to rock to and fro | - |
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| (noun) a chair mounted on rockers | Synonyms: rocking chair |
| (noun) an ice skate with a curved blade | - |
| (noun) a trough that can be rocked back and forth; used by gold miners to shake auriferous earth in water in order to separate the gold | Synonyms: cradle |
| (noun) a teenager or young adult in the 1960s who wore leather jackets and rode motorcycles | - |
| (noun) a performer or composer or fan of rock music | Synonyms: rock 'n' roll musician |
| (noun) an attendant who rocks a child in a cradle | - |
| rockers | (noun) originally a British youth subculture that evolved out of the teddy boys in the 1960s; wore black leather jackets and jeans and boots; had greased hair and rode motorcycles and listened to rock'n'roll; were largely unskilled manual laborers | Synonyms: bikers |
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| rockery | (noun) a garden featuring rocks; usually alpine plants | Synonyms: rock garden |
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| rocket | (noun) a jet engine containing its own propellant and driven by reaction propulsion | Synonyms: rocket engine |
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| (noun) any vehicle self-propelled by a rocket engine | Synonyms: projectile |
| (noun) sends a firework display high into the sky | Synonyms: skyrocket |
| (noun) propels bright light high in the sky, or used to propel a lifesaving line or harpoon | Synonyms: skyrocket |
| (noun) erect European annual often grown as a salad crop to be harvested when young and tender | Synonyms: arugula, Eruca sativa, Eruca vesicaria sativa, garden rocket, rocket salad, roquette |
| rocketry | (noun) the branch of engineering science that studies rocket design and operation | - |
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| rockfish | (noun) marine food fish found among rocks along the northern coasts of Europe and America | - |
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| (noun) marine food and game fish with dark longitudinal stripes; migrates upriver to spawn; sometimes placed in the genus Morone | Synonyms: Roccus saxatilis, striped bass, striper |
| (noun) the lean flesh of any of various valuable market fish caught among rocks | - |
| rockfoil | (noun) any of various plants of the genus Saxifraga | Synonyms: breakstone, saxifrage |
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| rockiness | (noun) the quality of abounding in rocks and stones | - |
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| rockrose | (noun) small shrubs of scrub and dry woodland regions of southern Europe and North Africa; grown for their showy flowers and soft often downy and aromatic evergreen foliage | Synonyms: rock rose |
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| (noun) any of numerous varieties of helianthemums having small rose-like yellow or white or reddish flowers | Synonyms: rock rose |
| rockslide | (noun) a landslide of rocks | - |
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| rockweed | (noun) coarse brown seaweed growing on rocks exposed at low tide | - |
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