| rood | (noun) representation of the cross on which Jesus died | Synonyms: crucifix, rood-tree |
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| roof | (noun) a protective covering that covers or forms the top of a building | - |
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| (noun) protective covering on top of a motor vehicle | - |
| (noun) an upper limit on what is allowed | Synonyms: cap, ceiling |
| (noun) the inner top surface of a covered area or hollow space | - |
| roofer | (noun) a craftsman who lays or repairs roofs | - |
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| roofing | (noun) the craft of a roofer | - |
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| (noun) material used to construct a roof | - |
| rooftop | (noun) the top of a (usually flat) roof | - |
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| rooftree | (noun) a beam laid along the edge where two sloping sides of a roof meet at the top; provides an attachment for the upper ends of rafters | Synonyms: ridge, ridgepole |
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| roofy | (noun) street names for flunitrazepam | Synonyms: circle, forget me drug, Mexican valium, R-2, roach, rope, rophy |
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| rooibos | (noun) South African shrub having flat acuminate leaves and yellow flowers; leaves are aromatic when dried and used to make an herbal tea | Synonyms: Aspalathus cedcarbergensis, Aspalathus linearis |
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| rook | (noun) common gregarious Old World bird about the size and color of the American crow | Synonyms: Corvus frugilegus |
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| (noun) (chess) the piece that can move any number of unoccupied squares in a direction parallel to the sides of the chessboard | Synonyms: castle |
| rookery | (noun) a breeding ground for gregarious birds (such as rooks) | - |
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| rookie | (noun) an awkward and inexperienced youth | Synonyms: cub, greenhorn |
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| room | (noun) an area within a building enclosed by walls and floor and ceiling | - |
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| (noun) the people who are present in a room | - |
| (noun) space for movement | Synonyms: elbow room, way |
| (noun) opportunity for | - |
| roomer | (noun) a tenant in someone's house | Synonyms: boarder, lodger |
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| roomette | (noun) a small private compartment for one on a sleeping car | - |
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| roomful | (noun) the quantity a room will hold | - |
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| roomie | (noun) an associate who shares a room with you | Synonyms: roommate, roomy |
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| roominess | (noun) spatial largeness and extensiveness (especially inside a building) | Synonyms: capaciousness, commodiousness, spaciousness |
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| (noun) intellectual breadth | Synonyms: capaciousness |
| roommate | (noun) an associate who shares a room with you | Synonyms: roomie, roomy |
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| rooms | (noun) apartment consisting of a series of connected rooms used as a living unit (as in a hotel) | Synonyms: suite |
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| roomy | (noun) an associate who shares a room with you | Synonyms: roomie, roommate |
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| roost | (noun) a perch on which domestic fowl rest or sleep | - |
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| (noun) a shelter with perches for fowl or other birds | - |
| rooster | (noun) adult male chicken | Synonyms: cock |
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| root | (noun) the embedded part of a bodily structure such as a tooth, nail, or hair | - |
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| (noun) (linguistics) the form of a word after all affixes are removed | Synonyms: base, radical, root word, stem, theme |
| (noun) a simple form inferred as the common basis from which related words in several languages can be derived by linguistic processes | Synonyms: etymon |
| (noun) the set of values that give a true statement when substituted into an equation | Synonyms: solution |
| (noun) the place where something begins, where it springs into being | Synonyms: beginning, origin, rootage, source |
| (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: ancestor, antecedent, ascendant, ascendent |
| (noun) (botany) the usually underground organ that lacks buds or leaves or nodes; absorbs water and mineral salts; usually it anchors the plant to the ground | - |
| (noun) a number that, when multiplied by itself some number of times, equals a given number | - |
| rootage | (noun) the place where something begins, where it springs into being | Synonyms: beginning, origin, root, source |
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| (noun) a developed system of roots | Synonyms: root system |
| (noun) fixedness by or as if by roots | - |
| rooter | (noun) an enthusiastic devotee of sports | Synonyms: fan, sports fan |
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| rooting | (noun) the process of putting forth roots and beginning to grow | - |
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| rootlet | (noun) small root or division of a root | - |
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| roots | (noun) the condition of belonging to a particular place or group by virtue of social or ethnic or cultural lineage | - |
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| rootstalk | (noun) a horizontal plant stem with shoots above and roots below serving as a reproductive structure | Synonyms: rhizome, rootstock |
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| rootstock | (noun) root or part of a root used for plant propagation; especially that part of a grafted plant that supplies the roots | - |
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| (noun) a horizontal plant stem with shoots above and roots below serving as a reproductive structure | Synonyms: rhizome, rootstalk |