| abuser | (noun) someone who abuses | Synonyms: maltreater |
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| accuser | (noun) someone who imputes guilt or blame | - |
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| arouser | (noun) someone who rouses others from sleep | Synonyms: rouser, waker |
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| carouser | (noun) someone who enjoys riotous drinking | Synonyms: wassailer |
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| diffuser | (noun) optical device that distributes the light of a lamp evenly | Synonyms: diffusor |
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| (noun) baffle that distributes sound waves evenly | Synonyms: diffusor |
| excuser | (noun) a person who pardons or forgives or excuses a fault or offense | Synonyms: forgiver, pardoner |
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| mouser | (noun) a cat proficient at mousing | - |
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| muser | (noun) a reflective thinker characterized by quiet contemplation | Synonyms: muller, ponderer, ruminator |
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| rouser | (noun) someone who rouses others from sleep | Synonyms: arouser, waker |
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| trouser | (noun) a garment (or part of a garment) designed for or relating to trousers | - |
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| user | (noun) a person who makes use of a thing; someone who uses or employs something | - |
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| (noun) a person who uses something or someone selfishly or unethically | Synonyms: exploiter |
| (noun) a person who takes drugs | Synonyms: drug user, substance abuser |
| warehouser | (noun) a workman who manages or works in a warehouse | Synonyms: warehouseman |
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