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There are 19 fifteen-letter words containing A, 2O, P, 2R, S and U

AUTOBIOGRAPHERSautobiographers n. Plural of autobiographer.
AUTOBIOGRAPHER n. one who writes autobiographies.
AUTORADIOGRAPHSautoradiographs n. Plural of autoradiograph.
AUTORADIOGRAPH n. an autoradiographic record, also RADIOAUTOGRAPH.
CHROMATOPHOROUSCHROMATOPHOROUS adj. of or like a chromatophore, a pigment-bearing cell.
COUNTERPROPOSALcounterproposal n. A proposal made as an alternative to another, earlier proposal.
counter-proposal n. Alternative form of counterproposal.
COUNTERPROPOSAL n. a return proposal made by one who has rejected a proposal.
MACROSPORANGIUMmacrosporangium n. (Botany) A megasporangium; sporangium or conceptacle containing only large spores; opposed to microsporangium.
MACROSPORANGIUM n. a sporangium producing only megaspores.
MICROSPORANGIUMmicrosporangium n. (Botany) A case, capsule or container that holds microspores.
MICROSPORANGIUM n. the sporangium in heterosporous plants where the microspores develop.
OVERPERSUASIONSoverpersuasions n. Plural of overpersuasion.
OVERPERSUASION n. excessive persuasion.
PARTHENOCARPOUSparthenocarpous adj. Alternative form of parthenocarpic.
PARTHENOCARPOUS adj. relating to parthenocarpy.
PROCURATORSHIPSprocuratorships n. Plural of procuratorship.
PROCURATORSHIP n. the office of procurator.
PROTOSPATHARIUSprotospatharius n. Alternative form of protospatharios.
PROTOSPATHARIUS n. (historical) the captain of the guards at Byzantium, also PROTOSPATAIRE, PROTOSPATHAIRE.
PSEUDOARTHROSESpseudoarthroses n. Plural of pseudoarthrosis.
PSEUDOARTHROSIS n. a joint formed by fibrous tissue bridging the gap between the two fragments of bone of an old fracture that have not united, also PSEUDARTHROSIS.
PSEUDOARTHROSISpseudoarthrosis n. Alternative form of pseudarthrosis.
PSEUDOARTHROSIS n. a joint formed by fibrous tissue bridging the gap between the two fragments of bone of an old fracture that have not united, also PSEUDARTHROSIS.
RADIOAUTOGRAPHSradioautographs n. Plural of radioautograph.
RADIOAUTOGRAPH n. an autoradiographic record, also AUTORADIOGRAPH.
RADIOPHOSPHORUSradiophosphorus n. Radioactive phosphorus (especially when used as a tracer).
RADIOPHOSPHORUS n. a radioactive isotope of phosphorus.
SUPEREROGATIONSsupererogations n. Plural of supererogation.
SUPEREROGATION n. the act of performing more than is required by duty, obligation or need.
SUPERORDINATIONsuperordination n. The ordination of a person to fill a station already occupied; especially, the ordination by an ecclesiastical…
superordination n. (Logic) The relation of a universal proposition to a particular proposition in the same terms.
SUPERORDINATION n. the relation of a universal proposition to a particular proposition in the same terms.
ULTRAMICROSCOPEultramicroscope n. A microscope that uses bright illumination against a black background to view small particles.
ULTRAMICROSCOPE n. an instrument for viewing extremely small objects.
ULTRAMICROSCOPYultramicroscopy n. The scientific use of the ultramicroscope.
ULTRAMICROSCOPY n. microscopy using an ultramicroscope.
ULTRASONOGRAPHYultrasonography n. (Medicine) The use of ultrasound to produce diagnostic images of the internal organs of the body, or of a foetus.
ultrasonography n. The use of ultrasound to form images of underwater structures.
ULTRASONOGRAPHY n. the use of ultrasound.

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 WikWik.org and 1Word.ws.

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See this list for:

  • English Wiktionary: 157 words
  • Scrabble in French: 31 words
  • Scrabble in Spanish: 40 words
  • Scrabble in Italian: 49 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 105 words


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