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There are 20 twelve-letter words containing I, 2M, P, R and U

AUTOMORPHISMautomorphism n. (Algebra) An isomorphism of a mathematical object or system of objects onto itself.
automorphism n. The ascription to others of one’s own characteristics.
AUTOMORPHISM n. ascription to others of one's own characteristics.
CUPRAMMONIUMcuprammonium n. (Inorganic chemistry) Synonym of cuproammonium.
CUPRAMMONIUM n. a solution of cupric hydroxide in ammonia.
EMPYREUMATICempyreumatic adj. (Obsolete, chemistry) Characteristic of empyreuma.
EMPYREUMATIC adj. relating to empyreuma, also EMPYREUMATICAL.
LITHOSPERMUMlithospermum n. (Botany) Any plant of the genus Lithospermum.
Lithospermum prop.n. A taxonomic genus within the family Boraginaceae – the stoneseeds and gromwells.
LITHOSPERMUM n. a kind of flower.
MENISPERMUMSMENISPERMUM n. any plant of the moonseed genus Menispermum.
MINICOMPUTERminicomputer n. (Computer hardware) A computer smaller than a mainframe, but larger than a microcomputer.
MINICOMPUTER n. a small computer that is intermediate between a microcomputer and a mainframe.
MUGWUMPERIESMUGWUMPERY n. the acts and views of a mugwump, a bolter from the Republican party in 1884; a political independent.
MULTIPROBLEMmultiproblem adj. Involving more than one problem.
MULTIPROBLEM adj. featuring many problems.
PRASEODYMIUMpraseodymium n. A chemical element (symbol Pr) with an atomic number of 59, a soft, silvery, malleable and ductile metal…
PRASEODYMIUM n. a chemical element, a metal with green salts, isolated from the once-supposed element didymium.
PROGYMNASIUMprogymnasium n. In Germany, a classical school without the higher classes; a school preparatory to a gymnasium.
PROGYMNASIUM n. in Germany, a gymnasium for pupils up to age 16 only, at which university entrance qualifications are not obtainable.
PROTHALAMIUMprothalamium n. Alternative form of prothalamion.
PROTHALAMIUM n. (Spenser) a song in honour of a marriage, also PROTHALAMION.
RUMGUMPTIONSRUMGUMPTION n. (Scots) common sense, also RUMBLEGUMPTION, RUMELGUMPTION, RUMLEGUMPTION, RUMMELGUMPTION, RUMMLEGUMPTION.
SEMPERVIVUMSsempervivums n. Plural of sempervivum.
SEMPERVIVUM n. a plant, the houseleek.
SEMPITERNUMSsempiternums n. Plural of sempiternum.
SEMPITERNUM n. (obsolete) a durable woollen cloth.
SPERMAGONIUMspermagonium n. (Lichenology) Alternative spelling of spermogonium.
SPERMAGONIUM n. a receptacle in which spermatia are produced in some fungi and lichens.
SPERMOGONIUMspermogonium n. (Lichenology) A conceptacle of certain lichens, containing spermatia.
SPERMOGONIUM n. a flask-shaped structure in some fungi, also SPERMOGONE.
SUPERPREMIUMsuperpremium adj. Of greatly superior quality, beyond premium.
superpremium n. A product or brand of greatly superior quality, beyond premium.
SUPERPREMIUM n. a very large premium.
SUPREMACISMSsupremacisms n. Plural of supremacism.
SUPREMACISM n. belief in the supremacy of one particular group of people.
SUPREMATISMSSUPREMATISM n. an early 20th century art movement in Russia producing abstract works featuring flat geometric forms.
TRIUMPHALISMtriumphalism n. The attitude or belief that a particular doctrine, culture, or social system, particularly a religious…
TRIUMPHALISM n. belief in the superiority of one particular religious creed.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the 1Word.ws and WikWik.org.

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