| amplifier | (noun) electronic equipment that increases strength of signals passing through it | - |
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| classifier | (noun) an algorithm that implements classification. | - |
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| (noun) a word or morpheme used in some languages in certain contexts (such as counting) to indicate the semantic class to which the counted item belongs | - |
| (noun) a person who creates classifications | - |
| complexifier | (noun) someone makes things complex | - |
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| dehumidifier | (noun) an appliance to extract moisture from the air and make the environment more comfortable | - |
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| emulsifier | (noun) a surface-active agent that promotes the formation of an emulsion | - |
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| falsifier | (noun) someone who falsifies | - |
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| humidifier | (noun) an appliance designed to add moisture to the air in a building | - |
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| identifier | (noun) a symbol that establishes the identity of the one bearing it | - |
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| intensifier | (noun) a modifier that has little meaning except to intensify the meaning it modifies | Synonyms: intensive |
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| justifier | (noun) a person who argues to defend or justify some policy or institution | Synonyms: apologist, vindicator |
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| magnifier | (noun) a scientific instrument that magnifies an image | - |
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| modifier | (noun) a gene that modifies the effect produced by another gene | Synonyms: modifier gene |
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| (noun) a content word that qualifies the meaning of a noun or verb | Synonyms: qualifier |
| (noun) a person who changes something | Synonyms: changer |
| (noun) a moderator who makes less extreme or uncompromising | - |
| mystifier | (noun) a particularly baffling problem that is said to have a correct solution | Synonyms: puzzle, puzzler, teaser |
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| nullifier | (noun) an advocate of nullification; someone who believes that a state can resist federal laws | - |
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| (noun) an official who can invalidate or nullify | Synonyms: invalidator, voider |
| pacifier | (noun) device used for an infant to suck or bite on | Synonyms: baby's dummy, comforter, teething ring |
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| (noun) anything that serves to pacify | - |
| (noun) someone who tries to bring peace | Synonyms: conciliator, make-peace, peacemaker, reconciler |
| purifier | (noun) an apparatus for removing impurities | - |
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| qualifier | (noun) a content word that qualifies the meaning of a noun or verb | Synonyms: modifier |
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| (noun) a contestant who meets certain requirements and so qualifies to take part in the next stage of competition | - |
| quantifier | (noun) (grammar) a word that expresses a quantity (as `fifteen' or `many') | - |
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| (noun) (logic) a word (such as `some' or `all' or `no') that binds the variables in a logical proposition | Synonyms: logical quantifier |
| ratifier | (noun) someone who expresses strong approval | Synonyms: endorser, indorser, subscriber |
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| rectifier | (noun) electrical device that transforms alternating into direct current | - |
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| (noun) a person who corrects or sets right | - |
| satisfier | (noun) any agent capable of producing satisfaction | - |
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| signifier | (noun) the phonological or orthographic sound or appearance of a word that can be used to describe or identify something | Synonyms: descriptor, form, word form |
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| specifier | (noun) someone who draws up specifications giving details (as for obtaining a patent) | - |
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| speechifier | (noun) a person who delivers a speech or oration | Synonyms: orator, public speaker, rhetorician, speechmaker |
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| testifier | (noun) a person who testifies or gives a deposition | Synonyms: deponent, deposer |
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| verifier | (noun) someone who vouches for another or for the correctness of a statement | Synonyms: voucher |
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| versifier | (noun) a writer who composes rhymes; a maker of poor verses (usually used as terms of contempt for minor or inferior poets) | Synonyms: poetiser, poetizer, rhymer, rhymester |
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| vilifier | (noun) one who attacks the reputation of another by slander or libel | Synonyms: backbiter, defamer, libeler, maligner, slanderer, traducer |
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