| brookweed | (noun) water pimpernel of Europe to China | Synonyms: Samolus valerandii |
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| (noun) American water pimpernel | Synonyms: Samolus floribundus, Samolus parviflorus |
| chickweed | (noun) any of various plants of the genus Stellaria | - |
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| (noun) any of various plants related to the common chickweed | Synonyms: clammy chickweed, mouse-ear chickweed, mouse ear, mouse eared chickweed |
| duckweed | (noun) any small or minute aquatic plant of the family Lemnaceae that float on or near the surface of shallow ponds | - |
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| hawkweed | (noun) any of numerous often hairy plants of the genus Hieracium having yellow or orange flowers that resemble the dandelion | - |
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| (noun) any of various plants of the genus Pilosella | - |
| kweek | (noun) trailing grass native to Europe now cosmopolitan in warm regions; used for lawns and pastures especially in southern United States and India | Synonyms: Bahama grass, Bermuda grass, Cynodon dactylon, devil grass, doob, scutch grass, star grass |
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| markweed | (noun) climbing plant common in eastern and central United States with ternate leaves and greenish flowers followed by white berries; yields an irritating oil that causes a rash on contact | Synonyms: poison ivy, poison mercury, poison oak, Rhus radicans, Toxicodendron radicans |
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| milkweed | (noun) any of numerous plants of the genus Asclepias having milky juice and pods that split open releasing seeds with downy tufts | Synonyms: silkweed |
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| (noun) annual Eurasian sow thistle with soft spiny leaves and rayed yellow flower heads | Synonyms: Sonchus oleraceus |
| rockweed | (noun) coarse brown seaweed growing on rocks exposed at low tide | - |
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| silkweed | (noun) any of numerous plants of the genus Asclepias having milky juice and pods that split open releasing seeds with downy tufts | Synonyms: milkweed |
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| skunkweed | (noun) tall herb of the Rocky Mountains having sticky leaves and an offensive smell | Synonyms: Polemonium viscosum, skunk-weed |
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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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| 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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| workweek | (noun) hours or days of work in a calendar week | Synonyms: week |
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