| conundrum | (noun) a difficult problem | Synonyms: brain-teaser, enigma, riddle |
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| drum | (noun) small to medium-sized bottom-dwelling food and game fishes of shallow coastal and fresh waters that make a drumming noise | Synonyms: drumfish |
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| (noun) a musical percussion instrument; usually consists of a hollow cylinder with a membrane stretched across each end | Synonyms: membranophone, tympan |
| (noun) a cylindrical metal container, commonly used for shipping or storage of liquids | Synonyms: metal drum |
| (noun) a hollow cast iron cylinder attached to the wheel that forms part of the brakes | Synonyms: brake drum |
| (noun) the sound of a drum | - |
| (noun) a bulging cylindrical shape; hollow with flat ends | Synonyms: barrel |
| (verb) study intensively, as before an exam | Synonyms: bone, bone up, cram, get up, grind away, mug up, swot, swot up |
| (verb) play a percussion instrument | - |
| (verb) make a rhythmic sound | Synonyms: beat, thrum |
| eardrum | (noun) the membrane in the ear that vibrates to sound | Synonyms: myringa, tympanic membrane, tympanum |
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| humdrum | (adjective) tediously repetitious or lacking in variety | Synonyms: monotonous |
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| (adjective) not challenging; dull and lacking excitement | Synonyms: commonplace, prosaic, unglamorous, unglamourous |
| (noun) the quality of wearisome constancy, routine, and lack of variety | Synonyms: monotony, sameness |
| kettledrum | (noun) a large hemispherical brass or copper percussion instrument with a drumhead that can be tuned by adjusting the tension on it | Synonyms: kettle, timpani, tympani, tympanum |
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| panjandrum | (noun) an important or influential (and often overbearing) person | Synonyms: dignitary, high-up, high muckamuck, very important person, VIP |
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