| soapweed | (noun) tall arborescent yucca of southwestern United States | Synonyms: soap-weed, soap tree, Yucca elata |
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| speed | (noun) changing location rapidly | Synonyms: hurrying, speeding |
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| (noun) a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression | Synonyms: amphetamine, pep pill, upper |
| (noun) a rate (usually rapid) at which something happens | Synonyms: fastness, swiftness |
| (noun) the ratio of the focal length to the diameter of a (camera) lens system | Synonyms: f number, focal ratio, stop number |
| (noun) distance travelled per unit time | Synonyms: velocity |
| steed | (noun) (literary) a spirited horse for state of war | - |
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| stickweed | (noun) any of several herbaceous plants having seeds that cling to clothing | - |
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| stinkweed | (noun) foetid Eurasian weed having round flat pods; naturalized throughout North America | Synonyms: fanweed, field pennycress, French weed, mithridate mustard, penny grass, Thlaspi arvense |
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| tarweed | (noun) any of various resinous glandular plants of the genus Madia; of western North and South America | - |
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| (noun) any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock | Synonyms: gum plant, gumweed, rosinweed |
| thimbleweed | (noun) a common North American anemone with cylindrical fruit clusters resembling thimbles | Synonyms: Anemone cylindrica |
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| tickseed | (noun) any of numerous plants of the genus Coreopsis having a profusion of showy usually yellow daisylike flowers over long periods; North and South America | Synonyms: coreopsis, tick-weed, tickweed |
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| tickweed | (noun) any of numerous plants of the genus Coreopsis having a profusion of showy usually yellow daisylike flowers over long periods; North and South America | Synonyms: coreopsis, tick-weed, tickseed |
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| tumbleweed | (noun) any plant that breaks away from its roots in autumn and is driven by the wind as a light rolling mass | - |
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| (noun) bushy annual weed of central North America having greenish flowers and winged seeds | Synonyms: Cycloloma atriplicifolium, winged pigweed |
| (noun) bushy plant of western United States | Synonyms: Amaranthus albus, Amaranthus graecizans |
| (noun) prickly bushy Eurasian plant; a troublesome weed in central and western United States | Synonyms: Russian cactus, Russian thistle, Russian tumbleweed, Salsola kali tenuifolia |
| tweed | (noun) thick woolen fabric used for clothing; originated in Scotland | - |
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| (noun) (usually in the plural) trousers made of flannel or gabardine or tweed or white cloth | Synonyms: flannel, gabardine, white |
| velvetweed | (noun) tall annual herb or subshrub of tropical Asia having velvety leaves and yellow flowers and yielding a strong fiber; naturalized in southeastern Europe and United States | Synonyms: Abutilon theophrasti, butter-print, China jute, Indian mallow, velvet-leaf, velvetleaf |
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| vinegarweed | (noun) aromatic plant of western United States | Synonyms: camphorweed, Trichostema lanceolatum, turpentine camphor weed |
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| wartweed | (noun) not unattractive European weed whose flowers turn toward the sun | Synonyms: devil's milk, Euphorbia helioscopia, sun spurge, wartwort |
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| waterweed | (noun) a weedy aquatic plant of genus Elodea | - |
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| weed | (noun) street names for marijuana | Synonyms: dope, gage, grass, green goddess, locoweed, Mary Jane, pot, sens, sess, skunk, smoke |
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| (noun) a black band worn by a man (on the arm or hat) as a sign of mourning | Synonyms: mourning band |
| (noun) any plant that crowds out cultivated plants | - |
| wormseed | (noun) rank-smelling tropical American pigweed | Synonyms: American wormseed, Chenopodium ambrosioides, Mexican tea, Spanish tea |
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