| immunologist | (noun) a medical scientist who specializes in immunology | - |
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| imperialist | (noun) a believer in imperialism | - |
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| impost | (noun) the lowest stone in an arch -- from which it springs | Synonyms: springer |
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| (noun) money collected under a tariff | Synonyms: custom, customs, customs duty |
| impressionist | (noun) an artist who follows the theories of Impressionism | - |
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| incest | (noun) sexual intercourse between persons too closely related to marry (as between a parent and a child) | - |
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| individualist | (noun) a person who pursues independent thought or action | - |
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| industrialist | (noun) someone who manages or has significant financial interest in an industrial enterprise | - |
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| inquest | (noun) an inquiry into the cause of an unexpected death | - |
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| instrumentalist | (noun) someone who plays a music as a profession | Synonyms: musician, player |
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| insurrectionist | (noun) a person who takes part in an armed rebellion against the constituted authority (especially in the hope of improving conditions) | Synonyms: freedom fighter, insurgent, rebel |
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| interest | (noun) a diversion that occupies one's time and thoughts (usually pleasantly) | Synonyms: pastime, pursuit |
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| (noun) a reason for wanting something done | Synonyms: sake |
| (noun) the power of attracting or holding one's attention (because it is unusual or exciting etc.) | Synonyms: interestingness |
| (noun) a sense of concern with and curiosity about someone or something | Synonyms: involvement |
| (noun) (usually plural) a social group whose members control some field of activity and who have common aims | Synonyms: interest group |
| (noun) a fixed charge for borrowing money; usually a percentage of the amount borrowed | - |
| (noun) (law) a right or legal share of something; a financial involvement with something | Synonyms: stake |
| internationalist | (noun) an advocate of internationalism | - |
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| (noun) a member of a socialist or communist international | - |
| internist | (noun) a specialist in internal medicine | - |
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| ironist | (noun) a humorist who uses ridicule and irony and sarcasm | Synonyms: ridiculer, satirist |
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| irredentist | (noun) an advocate of irredentism | Synonyms: irridentist |
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| irreligionist | (noun) someone who is indifferent or hostile to religion | - |
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| irridentist | (noun) an advocate of irredentism | Synonyms: irredentist |
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| isolationist | (noun) an advocate of isolationism in international affairs | - |
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| jest | (noun) activity characterized by good humor | Synonyms: jocularity, joke |
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| (noun) a humorous anecdote or remark intended to provoke laughter | Synonyms: gag, jape, joke, laugh |
| jiggermast | (noun) any small mast on a sailing vessel; especially the mizzenmast of a yawl | Synonyms: jigger |
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| jingoist | (noun) an extreme bellicose nationalist | Synonyms: chauvinist, flag-waver, hundred-percenter, jingo, patrioteer |
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| joist | (noun) beam used to support floors or roofs | - |
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| journalist | (noun) a writer for newspapers and magazines | - |
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| (noun) someone who keeps a diary or journal | Synonyms: diarist, diary keeper |
| joust | (noun) a combat between two mounted knights tilting against each other with blunted lances | Synonyms: tilt |
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| jurist | (noun) a legal scholar versed in civil law or the law of nations | Synonyms: legal expert |
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| (noun) a public official authorized to decide questions brought before a court of justice | Synonyms: judge, justice |
| kabbalist | (noun) an expert who is highly skilled in obscure or difficult or esoteric matters | Synonyms: cabalist |
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| keyboardist | (noun) a musician who plays a keyboard instrument | - |
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| knackwurst | (noun) short thick highly seasoned sausage | Synonyms: knockwurst |
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| knockwurst | (noun) short thick highly seasoned sausage | Synonyms: knackwurst |
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| lamppost | (noun) a metal post supporting an outdoor lamp (such as a streetlight) | - |
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| landscapist | (noun) someone who paints landscapes | - |
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| (noun) someone who arranges features of the landscape or garden attractively | Synonyms: landscape architect, landscape gardener, landscaper |
| lapidarist | (noun) an expert on precious stones and the art of cutting and engraving them | Synonyms: lapidary |
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| lapidist | (noun) a skilled worker who cuts and engraves precious stones | Synonyms: lapidary |
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| larcenist | (noun) a person who commits larceny | Synonyms: larcener |
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| last | (noun) a person's dying act; the final thing a person can do | - |
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| (noun) holding device shaped like a human foot that is used to fashion or repair shoes | Synonyms: cobbler's last, shoemaker's last |
| (noun) the final stage or concluding parts of an event or occurrence | Synonyms: end |
| (noun) a unit of capacity for grain equal to 80 bushels | - |
| (noun) a unit of weight equal to 4,000 pounds | - |
| (noun) the last or lowest in an ordering or series | - |
| (noun) the temporal end; the concluding time | Synonyms: close, conclusion, finale, finis, finish, stopping point |
| (noun) the time at which life ends; continuing until dead | Synonyms: death |
| latest | (noun) the most recent news or development | - |
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| least | (noun) something that is of no importance | - |
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| leftist | (noun) a person who belongs to the political left | Synonyms: collectivist, left-winger |
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| lepidopterist | (noun) an entomologist who specializes in the collection and study of butterflies and moths | Synonyms: butterfly collector, lepidopterologist |
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| lepidopterologist | (noun) an entomologist who specializes in the collection and study of butterflies and moths | Synonyms: butterfly collector, lepidopterist |
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| lexicologist | (noun) a compiler or writer of a dictionary; a student of the lexical component of language | Synonyms: lexicographer |
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| liberalist | (noun) a person who favors a political philosophy of progress and reform and the protection of civil liberties | Synonyms: liberal, progressive |
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| librettist | (noun) author of words to be set to music in an opera or operetta | - |
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| limnologist | (noun) a specialist in the study of freshwater ponds and lakes | - |
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| linguist | (noun) a person who speaks more than one language | Synonyms: polyglot |
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| (noun) a specialist in linguistics | Synonyms: linguistic scientist |
| list | (noun) the property possessed by a line or surface that departs from the vertical | Synonyms: inclination, lean, leaning, tilt |
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| (noun) a database containing an ordered array of items (names or topics) | Synonyms: listing |
| liturgist | (noun) an authority on liturgies | - |
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| liverwurst | (noun) sausage containing ground liver | Synonyms: liver pudding, liver sausage |
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| lobbyist | (noun) someone who is employed to persuade legislators to vote for legislation that favors the lobbyist's employer | - |
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| locust | (noun) migratory grasshoppers of warm regions having short antennae | - |
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| (noun) any of various hardwood trees of the family Leguminosae | Synonyms: locust tree |
| (noun) hardwood from any of various locust trees | - |
| logomachist | (noun) someone given to disputes over words | Synonyms: logomach |
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| lost | (noun) people who are destined to die soon | Synonyms: doomed |
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| loyalist | (noun) a person who is loyal to their allegiance (especially in times of revolt) | Synonyms: stalwart |
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| lust | (noun) self-indulgent sexual desire (personified as one of the deadly sins) | Synonyms: luxuria |
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| (noun) a strong sexual desire | Synonyms: lecherousness, lustfulness |
| lutanist | (noun) a musician who plays the lute | Synonyms: lutenist, lutist |
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| lutenist | (noun) a musician who plays the lute | Synonyms: lutanist, lutist |
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| lutist | (noun) a musician who plays the lute | Synonyms: lutanist, lutenist |
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| lymphoblast | (noun) an immature lymphocyte | - |
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| lyricist | (noun) a person who writes the words for songs | Synonyms: lyrist |
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| lyrist | (noun) a person who writes the words for songs | Synonyms: lyricist |
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| machinist | (noun) a craftsman skilled in operating machine tools | Synonyms: mechanic, shop mechanic |
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| macroeconomist | (noun) an economist who specializes in macroeconomics | Synonyms: macroeconomic expert |
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| madrigalist | (noun) a singer of madrigals | - |
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| mainmast | (noun) the chief mast of a sailing vessel with two or more masts | - |
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| malacologist | (noun) a zoologist specializing in the study of mollusks | - |
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| mammalogist | (noun) one skilled in the study of mammals | - |
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| manicurist | (noun) a beautician who cleans and trims and polishes the fingernails | - |
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| manifest | (noun) a customs document listing the contents put on a ship or plane | - |
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| masochist | (noun) someone who obtains pleasure from receiving punishment | - |
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| mast | (noun) a vertical spar for supporting sails | - |
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| (noun) any sturdy upright pole | - |
| (noun) nuts of forest trees used as feed for swine | - |
| (noun) nuts of forest trees (as beechnuts and acorns) accumulated on the ground | - |
| materialist | (noun) someone who thinks that nothing exists but physical matter | - |
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| (noun) someone with great regard for material possessions | - |
| mechanist | (noun) a philosopher who subscribes to the doctrine of mechanism | - |
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| medalist | (noun) (golf) the winner at medal play of a tournament | Synonyms: medal winner, medallist |
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| (noun) someone who has won a medal | Synonyms: medallist |
| medallist | (noun) (golf) the winner at medal play of a tournament | Synonyms: medal winner, medalist |
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| (noun) someone who has won a medal | Synonyms: medalist |
| megaloblast | (noun) abnormally large red blood cell present in pernicious anemia and folic acid deficiency | - |
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| melanoblast | (noun) an epidermal cell that is a precursor of a melanocyte | - |
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| meliorist | (noun) a disputant who advocates reform | Synonyms: crusader, reformer, reformist, social reformer |
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| mesmerist | (noun) a person who induces hypnosis | Synonyms: hypnotiser, hypnotist, hypnotizer, mesmerizer |
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| mesoblast | (noun) the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue | Synonyms: mesoderm |
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| metallurgist | (noun) an engineer trained in the extraction and refining and alloying and fabrication of metals | Synonyms: metallurgical engineer |
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| meteorologist | (noun) a specialist who studies processes in the earth's atmosphere that cause weather conditions | - |
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| microbiologist | (noun) a specialist in microbiology | - |
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| microeconomist | (noun) an economist who specializes in microeconomics | Synonyms: microeconomic expert |
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| microscopist | (noun) a scientist who specializes in research with the use of microscopes | - |
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| midst | (noun) the location of something surrounded by other things | Synonyms: thick |
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| milepost | (noun) stone post at side of a road to show distances | Synonyms: milestone |
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| militarist | (noun) a person who advocates war or warlike policies | Synonyms: warmonger |
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| millenarist | (noun) a person who believes in the coming of the millennium (a time of great peace and prosperity) | Synonyms: chiliast, millenarian |
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| mineralogist | (noun) a scientist trained in mineralogy | - |
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| miniaturist | (noun) someone who paints tiny pictures in great detail | - |
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| minimalist | (noun) a practitioner or advocate of artistic minimalism | - |
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| (noun) a conservative who advocates only minor reforms in government or politics | - |
| misanthropist | (noun) someone who dislikes people in general | Synonyms: misanthrope |
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| misogamist | (noun) a person who hates marriage | - |
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| misogynist | (noun) a misanthrope who dislikes women in particular | Synonyms: woman hater |
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| mist | (noun) a thin fog with condensation near the ground | - |
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| mistrust | (noun) the trait of not trusting others | Synonyms: distrust, distrustfulness |
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| (noun) doubt about someone's honesty | Synonyms: distrust, misgiving, suspicion |
| mixologist | (noun) an employee who mixes and serves alcoholic drinks at a bar | Synonyms: barkeep, barkeeper, bartender |
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| mizenmast | (noun) third mast from the bow in a vessel having three or more masts; the after and shorter mast of a yawl, ketch, or dandy | Synonyms: mizen, mizzen, mizzenmast |
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| mizzenmast | (noun) third mast from the bow in a vessel having three or more masts; the after and shorter mast of a yawl, ketch, or dandy | Synonyms: mizen, mizenmast, mizzen |
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| mnemonist | (noun) an expert in the use of mnemonics; someone able to perform unusual feats of memory | - |
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