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There are 12 fifteen-letter words containing I, 2M, 2O, R, S and U

COMMENSURATIONScommensurations n. Plural of commensuration.
COMMENSURATION n. measurement by the same standard.
EXCOMMUNICATORSexcommunicators n. Plural of excommunicator.
EXCOMMUNICATOR n. one who excommunicates.
IMMUNOREACTIONSimmunoreactions n. Plural of immunoreaction.
IMMUNOREACTION n. the reaction between an antigen and its antibody.
INTERCOMMUNIONSintercommunions n. Plural of intercommunion.
INTERCOMMUNION n. interdenominational participation in communion.
MACROSPORANGIUMmacrosporangium n. (Botany) A megasporangium; sporangium or conceptacle containing only large spores; opposed to microsporangium.
MACROSPORANGIUM n. a sporangium producing only megaspores.
MICROCOMPUTINGSMICROCOMPUTING n. computing with a microcomputer.
MICROSPORANGIUMmicrosporangium n. (Botany) A case, capsule or container that holds microspores.
MICROSPORANGIUM n. the sporangium in heterosporous plants where the microspores develop.
PSEUDOMORPHISMSpseudomorphisms n. Plural of pseudomorphism.
PSEUDOMORPHISM n. the state of being pseudomorphic.
RUMORMONGERINGSRUMORMONGERING n. the spreading of rumours.
SUBCOMMISSIONERsubcommissioner n. A lesser or subsidiary commissioner.
SUBCOMMISSIONER n. a subordinate commissioner.
ULTRAMICROTOMESultramicrotomes n. Plural of ultramicrotome.
ULTRAMICROTOME n. a microtome for cutting extremely thin sections for electron microscopy.
UNCOMPROMISABLEuncompromisable adj. Not compromisable; that cannot be compromised; non-negotiable.
UNCOMPROMISABLE adj. not able to be compromised.

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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See this list for:

  • English Wiktionary: 97 words
  • Scrabble in French: 19 words
  • Scrabble in Spanish: 61 words
  • Scrabble in Italian: 67 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 33 words


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