| beluga | (noun) valuable source of caviar and isinglass; found in Black and Caspian seas | Synonyms: Acipenser huso, hausen, white sturgeon |
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| (noun) small northern whale that is white when adult | Synonyms: Delphinapterus leucas, white whale |
| colugo | (noun) arboreal nocturnal mammal of southeast Asia and the Philippines resembling a lemur and having a fold of skin on each side from neck to tail that is used for long gliding leaps | Synonyms: flying cat, flying lemur |
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| deluge | (noun) a heavy rain | Synonyms: cloudburst, downpour, pelter, soaker, torrent, waterspout |
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| (noun) the rising of a body of water and its overflowing onto normally dry land | Synonyms: alluvion, flood, inundation |
| (noun) an overwhelming number or amount | Synonyms: flood, inundation, torrent |
| (verb) fill or cover completely, usually with water | Synonyms: inundate, submerge |
| (verb) charge someone with too many tasks | Synonyms: flood out, overwhelm |
| (verb) fill quickly beyond capacity; as with a liquid | Synonyms: flood, inundate, swamp |
| difflugia | (noun) a protozoan with an ovoid shell of cemented sand grains | - |
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| drainplug | (noun) a removable plug for holding water in a tub or basin | - |
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| earplug | (noun) a plug of cotton, wax, or rubber that is fitted into the ear canal for protection against the entry of water or loud noise | - |
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| (noun) an earphone that is inserted into the ear canal | - |
| fireplug | (noun) an upright hydrant for drawing water to use in fighting a fire | Synonyms: fire hydrant, plug |
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| flugelhorn | (noun) a brass instrument resembling a cornet but with a wider bore | Synonyms: fluegelhorn |
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| glug | (verb) make a gurgling sound as of liquid issuing from a bottle | - |
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| lug | (noun) marine worms having a row of tufted gills along each side of the back; often used for fishing bait | Synonyms: lobworm, lugworm |
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| (noun) a projecting piece that is used to lift or support or turn something | - |
| (noun) a sail with four corners that is hoisted from a yard that is oblique to the mast | Synonyms: lugsail |
| (verb) carry with difficulty | Synonyms: tote, tug |
| (verb) obstruct | Synonyms: block, choke up, stuff |
| luge | (noun) a racing sled for one or two people | - |
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| (verb) move along on a luge or toboggan | Synonyms: toboggan |
| luger | (noun) someone who races the luge | Synonyms: slider |
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| luggage | (noun) cases used to carry belongings when traveling | Synonyms: baggage |
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| lugger | (noun) small fishing boat rigged with one or more lugsails | - |
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| luging | (noun) riding a light one-man toboggan | - |
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| lugsail | (noun) a sail with four corners that is hoisted from a yard that is oblique to the mast | Synonyms: lug |
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| lugubrious | (adjective) excessively mournful | - |
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| lugubriously | (adverb) in a sorrowful lugubrious manner | - |
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| lugubriousness | (noun) the quality of excessive mournfulness and uncheerfulness | Synonyms: gloominess, sadness |
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| lugworm | (noun) marine worms having a row of tufted gills along each side of the back; often used for fishing bait | Synonyms: lobworm, lug |
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| plug | (noun) an old or over-worked horse | Synonyms: hack, jade, nag |
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| (noun) blockage consisting of an object designed to fill a hole tightly | Synonyms: stopper, stopple |
| (noun) an upright hydrant for drawing water to use in fighting a fire | Synonyms: fire hydrant, fireplug |
| (noun) electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark | Synonyms: spark plug, sparking plug |
| (noun) an electrical device with two or three pins that is inserted in a socket to make an electrical connection | Synonyms: male plug |
| (noun) blatant or sensational promotion | Synonyms: ballyhoo, hoopla, hype |
| (noun) a wad of something chewable as tobacco | Synonyms: chaw, chew, cud, quid, wad |
| (verb) persist in working hard | Synonyms: plug away |
| (verb) insert as a plug | - |
| (verb) insert a plug into | - |
| (verb) replace the center of a coin with a baser metal | - |
| (verb) make a plug for; praise the qualities or in order to sell or promote | - |
| (verb) deliver a quick blow to | Synonyms: punch |
| (verb) fill or close tightly with or as if with a plug | Synonyms: secure, stop up |
| plugboard | (noun) telephone central where circuits are completed with patchcords | Synonyms: patchboard, switchboard |
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| plugged | (adjective) (of a coin) altered by the insertion of a plug of base metal | - |
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| (adjective) completely obstructed or closed off | Synonyms: blocked |
| plugger | (noun) someone who is an active supporter and advocate | Synonyms: booster, promoter |
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| plughole | (noun) a hole into which a plug fits (especially a hole where water drains away) | - |
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| slug | (noun) (boxing) a blow with the fist | Synonyms: biff, clout, lick, poke, punch |
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| (noun) any of various terrestrial gastropods having an elongated slimy body and no external shell | - |
| (noun) a projectile that is fired from a gun | Synonyms: bullet |
| (noun) a strip of type metal used for spacing | Synonyms: type slug |
| (noun) an amount of an alcoholic drink (usually liquor) that is poured or gulped | - |
| (noun) an idle slothful person | Synonyms: sluggard |
| (noun) a counterfeit coin | - |
| (noun) a unit of mass equal to the mass that accelerates at 1 foot/sec/sec when acted upon by a force of 1 pound; approximately 14.5939 kilograms | - |
| (verb) strike heavily, especially with the fist or a bat | Synonyms: slog, swig |
| (verb) be idle; exist in a changeless situation | Synonyms: idle, laze, stagnate |
| slugabed | (noun) a person who stays in bed until a relatively late hour | Synonyms: lie-abed |
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| slugfest | (noun) a fight with bare fists | Synonyms: fistfight, fisticuffs |
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| sluggard | (noun) an idle slothful person | Synonyms: slug |
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| slugger | (noun) (baseball) a ballplayer who is batting | Synonyms: batsman, batter, hitter |
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| (noun) a boxer noted for an ability to deliver hard punches | Synonyms: slogger |
| sluggish | (adjective) slow and apathetic | Synonyms: inert, soggy, torpid |
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| (adjective) (of business) not active or brisk | Synonyms: dull, slow |
| (adjective) slow or slothful | Synonyms: sulky |
| sluggishly | (adverb) in a sluggish manner | - |
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| sluggishness | (noun) inactivity; showing an unusual lack of energy | Synonyms: flatness, languor, lethargy, phlegm |
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| (noun) the pace of things that move relatively slowly | - |
| (noun) a state of comatose torpor (as found in sleeping sickness) | Synonyms: lassitude, lethargy |
| unplug | (verb) pull the plug of (electrical appliances) and render inoperable | Synonyms: disconnect |
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