| backswimmer | (noun) predaceous aquatic insect that swims on its back and may inflict painful bites | Synonyms: Notonecta undulata |
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| bummer | (noun) an experience that is irritating or frustrating or disappointing | - |
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| (noun) a bad reaction to a hallucinogenic drug | - |
| clawhammer | (noun) a hammer with a cleft at one end for pulling nails | Synonyms: carpenter's hammer, claw hammer |
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| crammer | (noun) a textbook designed for cramming | - |
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| (noun) a special school where students are crammed | - |
| (noun) a student who crams | - |
| (noun) a teacher who is paid to cram students for examinations | - |
| dimmer | (noun) a rheostat that varies the current through an electric light in order to control the level of illumination | - |
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| drummer | (noun) someone who plays a drum | - |
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| emmer | (noun) hard red wheat grown especially in Russia and Germany; in United States as stock feed | Synonyms: starch wheat, Triticum dicoccum, two-grain spelt |
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| glimmer | (noun) a slight suggestion or vague understanding | Synonyms: glimmering, inkling, intimation |
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| (noun) a flash of light (especially reflected light) | Synonyms: gleam, gleaming |
| (verb) shine brightly, like a star or a light | Synonyms: gleam |
| hammer | (noun) the act of pounding (delivering repeated heavy blows) | Synonyms: hammering, pound, pounding |
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| (noun) a hand tool with a heavy rigid head and a handle; used to deliver an impulsive force by striking | - |
| (noun) a power tool for drilling rocks | Synonyms: power hammer |
| (noun) a striker that is covered in felt and that causes the piano strings to vibrate | - |
| (noun) a light drumstick with a rounded head that is used to strike such percussion instruments as chimes, kettledrums, marimbas, glockenspiels, etc. | Synonyms: mallet |
| (noun) the part of a gunlock that strikes the percussion cap when the trigger is pulled | Synonyms: cock |
| (noun) a heavy metal sphere attached to a flexible wire; used in the hammer throw | - |
| (noun) the ossicle attached to the eardrum | Synonyms: malleus |
| (verb) beat with or as if with a hammer | - |
| (verb) create by hammering | Synonyms: forge |
| hummer | (noun) (baseball) a pitch thrown with maximum velocity | Synonyms: bullet, fastball, heater, smoke |
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| (noun) a singer who produces a tune without opening the lips or forming words | - |
| jackhammer | (noun) a hammer driven by compressed air | Synonyms: air hammer, pneumatic hammer |
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| jammer | (noun) a transmitter used to broadcast electronic jamming | - |
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| katzenjammer | (noun) loud confused noise from many sources | Synonyms: brouhaha, hubbub, uproar |
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| (noun) disagreeable aftereffects from the use of drugs (especially alcohol) | Synonyms: hangover |
| midsummer | (noun) June 21, when the sun is at its northernmost point | Synonyms: June 21, summer solstice |
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| mummer | (noun) an actor who communicates entirely by gesture and facial expression | Synonyms: mime, mimer, pantomimer, pantomimist |
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| programmer | (noun) a person who designs and writes and tests computer programs | Synonyms: coder, computer programmer, software engineer |
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| rammer | (noun) a tool for driving something with force | - |
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| rummer | (noun) a large drinking glass (ovoid bowl on a stem) for drinking toasts | - |
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| scammer | (noun) a person who swindles you by means of deception or fraud | Synonyms: chiseler, chiseller, defrauder, gouger, grifter, swindler |
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| shammer | (noun) a person who makes deceitful pretenses | Synonyms: fake, faker, fraud, imposter, impostor, pretender, pseud, pseudo, role player, sham |
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| (noun) someone shirking their duty by feigning illness or incapacity | Synonyms: malingerer, skulker |
| shimmer | (noun) a weak and tremulous light | Synonyms: play |
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| (verb) give off a shimmering reflection, as of silk | - |
| (verb) shine with a weak or fitful light | - |
| simmer | (noun) temperature just below the boiling point | - |
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| (verb) boil slowly at low temperature | - |
| skimmer | (noun) gull-like seabird that flies along the surface of the water with an elongated lower mandible immersed to skim out food | - |
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| (noun) a stiff hat made of straw with a flat crown | Synonyms: boater, leghorn, Panama, Panama hat, sailor, straw hat |
| (noun) a cooking utensil used to skim fat from the surface of liquids | - |
| (noun) a rapid superficial reader | - |
| slammer | (noun) a correctional institution used to detain persons who are in the lawful custody of the government (either accused persons awaiting trial or convicted persons serving a sentence) | Synonyms: clink, gaol, jail, jailhouse, pokey, poky |
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| (noun) a person who closes things violently | - |
| sledgehammer | (noun) a heavy long-handled hammer used to drive stakes or wedges | Synonyms: maul, sledge |
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| (verb) beat with a sledgehammer | Synonyms: sledge |
| spammer | (noun) someone who sends unwanted email (often in bulk) | - |
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| stammer | (noun) a speech disorder involving hesitations and involuntary repetitions of certain sounds | Synonyms: stutter |
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| (verb) speak haltingly | Synonyms: bumble, falter, stutter |
| stemmer | (noun) a device for removing stems from fruit (as from grapes or apples) | - |
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| (noun) a miner's tamping bar for ramming packing in over a blasting charge | - |
| (noun) an algorithm for removing inflectional and derivational endings in order to reduce word forms to a common stem | Synonyms: stemming algorithm |
| (noun) a worker who makes or applies stems for artificial flowers | - |
| (noun) a worker who strips the stems from moistened tobacco leaves and binds the leaves together into books | Synonyms: sprigger, stripper |
| summer | (noun) the warmest season of the year; in the Northern Hemisphere it extends from the summer solstice to the autumnal equinox | Synonyms: summertime |
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| (noun) the period of finest development, happiness, or beauty | - |
| (verb) spend the summer | - |
| swimmer | (noun) a trained athlete who participates in swimming meets | - |
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| (noun) a person who travels through the water by swimming | Synonyms: bather, natator |
| trimmer | (noun) joist that receives the end of a header in floor or roof framing in order to leave an opening for a staircase or chimney etc. | Synonyms: trimmer joist |
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| (noun) capacitor having variable capacitance; used for making fine adjustments | Synonyms: trimming capacitor |
| (noun) a machine that trims timber | - |
| (noun) a worker who thins out and trims trees and shrubs | Synonyms: pruner |
| triphammer | (noun) a massive power hammer; raised by a cam until released to fall under gravity | - |
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| windjammer | (noun) a large sailing ship | - |
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| yammer | (verb) complain whiningly | Synonyms: grizzle, whine, yawp |
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| (verb) cry loudly, as of animals | Synonyms: howl, wrawl, yowl |
| yellowhammer | (noun) European bunting the male being bright yellow | Synonyms: Emberiza citrinella, yellow bunting |
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| (noun) large flicker of eastern North America with a red neck and yellow undersurface to wings and tail | Synonyms: Colaptes auratus, yellow-shafted flicker |