| advisor | (noun) an expert who gives advice | Synonyms: adviser, consultant |
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| aggressor | (noun) someone who attacks | Synonyms: assailant, assaulter, attacker |
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| (noun) a confident assertive person who acts as instigator | - |
| assessor | (noun) an official who evaluates property for the purpose of taxing it | Synonyms: tax assessor |
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| censor | (noun) a person who is authorized to read publications or correspondence or to watch theatrical performances and suppress in whole or in part anything considered obscene or politically unacceptable | - |
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| (noun) someone who censures or condemns | - |
| compressor | (noun) a mechanical device that compresses gasses | - |
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| (noun) an electronic device that reduces the dynamic range of an audio signal. | - |
| confessor | (noun) a priest who hears confession and gives absolution | - |
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| (noun) someone who confesses (discloses information damaging to themselves) | - |
| cursor | (noun) (computer science) indicator consisting of a movable spot of light (an icon) on a visual display; moving it allows the user to point to commands or screen positions | Synonyms: pointer |
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| depressor | (noun) a device used by physician to press a part down or aside | - |
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| (noun) any skeletal muscle that draws a body part down | Synonyms: depressor muscle |
| (noun) any nerve whose activity tends to reduce the activity or tone of the body part it serves | Synonyms: depressor nerve |
| devisor | (noun) someone who devises real property in a will | - |
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| diffusor | (noun) optical device that distributes the light of a lamp evenly | Synonyms: diffuser |
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| (noun) baffle that distributes sound waves evenly | Synonyms: diffuser |
| divisor | (noun) the number by which a dividend is divided | - |
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| (noun) one of two or more integers that can be exactly divided into another integer | Synonyms: factor |
| extensor | (noun) a skeletal muscle whose contraction extends or stretches a body part | Synonyms: extensor muscle |
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| immunosuppressor | (noun) a drug that lowers the body's normal immune response | Synonyms: immune suppressant drug, immunosuppressant, immunosuppressive, immunosuppressive drug |
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| incisor | (noun) a tooth for cutting or gnawing; located in the front of the mouth in both jaws | - |
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| intercessor | (noun) a negotiator who acts as a link between parties | Synonyms: go-between, intermediary, intermediator, mediator |
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| lessor | (noun) someone who grants a lease | Synonyms: lease giver |
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| microprocessor | (noun) integrated circuit semiconductor chip that performs the bulk of the processing and controls the parts of a system | - |
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| microsensor | (noun) A submicrometer- to millimeter-size device that converts a nonelectrical physical or chemical quantity, such as pressure, acceleration, temperature, or gas concentration, into an electrical signal; it is generally able to offer better sensitivity, accuracy, dynamic range, and reliability, as well as lower power consumption, compared to larger counterparts. | - |
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| multiprocessor | (noun) a computer that uses two or more processing units under integrated control | - |
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| oppressor | (noun) a person of authority who subjects others to undue pressures | - |
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| percussor | (noun) (medicine) a small hammer with a rubber head used in percussive examinations of the chest and in testing reflexes | Synonyms: plessor, plexor |
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| plessor | (noun) (medicine) a small hammer with a rubber head used in percussive examinations of the chest and in testing reflexes | Synonyms: percussor, plexor |
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| possessor | (noun) a person who owns something | Synonyms: owner |
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| precursor | (noun) something that precedes and indicates the approach of something or someone | Synonyms: forerunner, harbinger, herald, predecessor |
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| (noun) a person who goes before or announces the coming of another | Synonyms: forerunner |
| (noun) a substance from which another substance is formed (especially by a metabolic reaction) | - |
| predecessor | (noun) something that precedes and indicates the approach of something or someone | Synonyms: forerunner, harbinger, herald, precursor |
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| (noun) one who precedes you in time (as in holding a position or office) | - |
| prehensor | (noun) the anterior pair of legs of a centipede that are modified to seize prey and inject venom from the toxicognaths | - |
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| pressor | (noun) any agent that causes a narrowing of an opening of a blood vessel: cold or stress or nicotine or epinephrine or norepinephrine or angiotensin or vasopressin or certain drugs; maintains or increases blood pressure | Synonyms: vasoconstrictive, vasoconstrictor |
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| processor | (noun) (computer science) the part of a computer (a microprocessor chip) that does most of the data processing | Synonyms: C.P.U., central processing unit, central processor, CPU, mainframe |
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| (noun) a business engaged in processing agricultural products and preparing them for market | - |
| (noun) someone who processes things (foods or photographs or applicants etc.) | - |
| professor | (noun) someone who is a member of the faculty at a college or university | Synonyms: prof |
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| promisor | (noun) a person who makes a promise | Synonyms: promiser |
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| repressor | (noun) an agent that represses | Synonyms: represser |
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| repulsor | (noun) a fictional anti-gravity device in the Star Wars Universe. | Synonyms: repulsorlift, repulsorlift engine |
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| (noun) A repulsor is either one of two drives located in the gauntlets of Iron Man's armor; they have been referred to as being magnetic, a blast of charged particles, and as a force beam. | - |
| sensor | (noun) any device that receives a signal or stimulus (as heat or pressure or light or motion etc.) and responds to it in a distinctive manner | Synonyms: detector, sensing element |
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| sponsor | (noun) someone who supports or champions something | Synonyms: patron, supporter |
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| (noun) an advocate who presents a person (as for an award or a degree or an introduction etc.) | Synonyms: presenter |
| stressor | (noun) any agent that causes stress to an organism | - |
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| successor | (noun) a thing or person that immediately replaces something or someone | - |
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| (noun) a person who inherits some title or office | Synonyms: heir |
| (noun) a person who follows next in order | Synonyms: replacement |
| supervisor | (noun) a program that controls the execution of other programs | Synonyms: executive program, supervisory program |
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| (noun) one who supervises or has charge and direction of | - |
| suppressor | (noun) an electrical device for suppressing unwanted currents | Synonyms: suppresser |
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| (noun) a gene that suppresses the phenotypic expression of another gene (especially of a mutant gene) | Synonyms: suppresser, suppresser gene, suppressor gene |
| (noun) someone who suppresses | Synonyms: suppresser |
| suspensor | (noun) a support for the genitals worn by men engaging in strenuous exercise | Synonyms: athletic supporter, jock, jockstrap, supporter |
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| tensor | (noun) any of several muscles that cause an attached structure to become tense or firm | - |
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| (noun) a generalization of the concept of a vector | - |
| thermocompressor | (noun) An injector, ejector, steam ejector, steam injector, eductor-jet pump or thermocompressor is a type of pump. | Synonyms: eductor-jet pump, ejector, injector, steam ejector, steam injector |
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| tortfeasor | (noun) a party who has committed a tort | Synonyms: tort-feasor |
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| transgressor | (noun) someone who transgresses; someone who violates a law or command | - |
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| vasopressor | (noun) any agent that produces vasoconstriction and a rise in blood pressure (usually understood as increased arterial pressure) | - |
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| visor | (noun) a brim that projects to the front to shade the eyes | Synonyms: bill, eyeshade, peak, vizor |
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| (noun) a piece of armor plate (with eye slits) fixed or hinged to a medieval helmet to protect the face | Synonyms: vizor |