| coefficient | (noun) a constant number that serves as a measure of some property or characteristic | - |
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| difficult | (adjective) not easy; requiring great physical or mental effort to accomplish or comprehend or endure | Synonyms: hard |
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| (adjective) hard to control | Synonyms: unmanageable |
| difficultness | (noun) the quality of being almost beyond one's ability to deal with and requiring a great effort to achieve a positive result | Synonyms: difficulty |
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| difficulty | (noun) an effort that is inconvenient | Synonyms: trouble |
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| (noun) the quality of being almost beyond one's ability to deal with and requiring a great effort to achieve a positive result | Synonyms: difficultness |
| efficacious | (adjective) marked by qualities giving the power to produce an intended effect | - |
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| (adjective) producing or capable of producing an intended result or having a striking effect | Synonyms: effective, effectual |
| efficaciously | (adverb) in an effective manner | Synonyms: effectively |
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| efficaciousness | (noun) capacity or power to produce a desired effect | Synonyms: efficacy |
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| efficacy | (noun) capacity or power to produce a desired effect | Synonyms: efficaciousness |
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| efficiency | (noun) skillfulness in avoiding wasted time and effort | - |
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| (noun) the ratio of the output to the input of any system | - |
| efficient | (adjective) being effective without wasting time or effort or expense | - |
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| (adjective) able to accomplish a purpose; functioning effectively | Synonyms: effective |
| efficiently | (adverb) with efficiency; in an efficient manner | Synonyms: expeditiously |
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| inefficacious | (adjective) lacking the power to produce a desired effect | - |
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| inefficaciously | (adverb) in an ineffective manner | Synonyms: ineffectively |
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| inefficaciousness | (noun) a lack of efficacy | Synonyms: inefficacy |
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| inefficacy | (noun) a lack of efficacy | Synonyms: inefficaciousness |
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| inefficiency | (noun) unskillfulness resulting from a lack of efficiency | - |
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| inefficient | (adjective) not producing desired results; wasteful | - |
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| (adjective) lacking the ability or skill to perform effectively; inadequate | Synonyms: ineffective |
| inefficiently | (adverb) in an inefficient manner | - |
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| insufficiency | (noun) lack of an adequate quantity or number | Synonyms: deficiency, inadequacy |
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| (noun) (pathology) inability of a bodily part or organ to function normally | - |
| (noun) a lack of competence | Synonyms: inadequacy |
| insufficient | (adjective) of a quantity not able to fulfill a need or requirement | Synonyms: deficient |
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| insufficiently | (adverb) to an insufficient degree | - |
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| narcotraffic | (noun) traffic in illegal drugs | Synonyms: drug traffic, drug trafficking |
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| office | (noun) a religious rite or service prescribed by ecclesiastical authorities | - |
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| (noun) the actions and activities assigned to or required or expected of a person or group | Synonyms: function, part, role |
| (noun) a job in an organization | Synonyms: berth, place, position, post, situation |
| (noun) place of business where professional or clerical duties are performed | Synonyms: business office |
| (noun) professional or clerical workers in an office | Synonyms: office staff |
| (noun) an administrative unit of government | Synonyms: agency, authority, bureau, federal agency, government agency |
| (noun) (of a government or government official) holding an office means being in power | Synonyms: power |
| officeholder | (noun) the official who holds an office | Synonyms: incumbent |
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| (noun) someone who is appointed or elected to an office and who holds a position of trust | Synonyms: officer |
| officer | (noun) a member of a police force | Synonyms: police officer |
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| (noun) someone who is appointed or elected to an office and who holds a position of trust | Synonyms: officeholder |
| (noun) any person in the armed services who holds a position of authority or command | Synonyms: military officer |
| (noun) a person authorized to serve in a position of authority on a vessel | Synonyms: ship's officer |
| (verb) direct or command as an officer | - |
| official | (adjective) having official authority or sanction | - |
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| (adjective) of or relating to an office | - |
| (adjective) verified officially | - |
| (adjective) (of a church) given official status as a national or state institution | - |
| (adjective) conforming to set usage, procedure, or discipline | Synonyms: prescribed |
| (noun) someone who administers the rules of a game or sport | - |
| (noun) a worker who holds or is invested with an office | Synonyms: functionary |
| officialdom | (noun) people elected or appointed to administer a government | Synonyms: government officials |
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| officialese | (noun) the style of writing characteristic of some government officials: formal and obscure | - |
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| officialise | (verb) make official | Synonyms: officialize |
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| officialize | (verb) make official | Synonyms: officialise |
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| officially | (adverb) in an official role | - |
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| (adverb) with official authorization | Synonyms: formally |
| officiant | (noun) a clergyman who officiates at a religious ceremony or service | - |
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| officiate | (verb) perform duties attached to a particular office or place or function | Synonyms: function |
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| (verb) act in an official capacity in a ceremony or religious ritual, such as a wedding | - |
| officiating | (noun) the act of umpiring | Synonyms: officiation, refereeing, umpirage |
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| officiation | (noun) the act of umpiring | Synonyms: officiating, refereeing, umpirage |
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| (noun) the performance of a religious or ceremonial or public duty | - |
| officious | (adjective) intrusive in a meddling or offensive manner | Synonyms: busy, busybodied, interfering, meddlesome, meddling |
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| officiously | (adverb) in an officious manner | - |
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| officiousness | (noun) aggressiveness as evidenced by intruding; by advancing yourself or your ideas without invitation | Synonyms: intrusiveness, meddlesomeness |
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| semiofficial | (adjective) having some official authority or sanction | - |
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| suffice | (verb) be sufficient; be adequate, either in quality or quantity | Synonyms: answer, do, serve |
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| sufficiency | (noun) the quality of being sufficient for the end in view | Synonyms: adequacy |
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| (noun) an adequate quantity; a quantity that is large enough to achieve a purpose | Synonyms: enough |
| (noun) sufficient resources to provide comfort and meet obligations | - |
| sufficient | (adjective) of a quantity that can fulfill a need or requirement but without being abundant | - |
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| sufficiently | (adverb) to a sufficient degree | - |
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| traffic | (noun) buying and selling; especially illicit trade | - |
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| (noun) social or verbal interchange (usually followed by `with') | Synonyms: dealings |
| (noun) the amount of activity over a communication system during a given period of time | - |
| (noun) the aggregation of things (pedestrians or vehicles) coming and going in a particular locality during a specified period of time | - |
| (verb) deal illegally | - |
| (verb) trade or deal a commodity | - |
| trafficator | (noun) a blinking light on a motor vehicle that indicates the direction in which the vehicle is about to turn | Synonyms: blinker, turn indicator, turn signal |
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| trafficker | (noun) someone who promotes or exchanges goods or services for money | Synonyms: marketer, seller, vender, vendor |
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| unofficial | (adjective) not having official authority or sanction | - |
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| (adjective) not officially established | - |
| unofficially | (adverb) not in an official capacity | - |
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| (adverb) without official approval | Synonyms: on the side |