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From letters R, E, D, U, C, T, I, O, N, I, S, M  I made following words

12 letter words

reductionism[17]

11 letter words

modernistic[16], neuroticism[15]

10 letter words

midsection[15], dosimetric[15], indecorums[15], miscounted[15], undomestic[15], minicourse[14], directions[13], discretion[13], discounter[13], introduces[13], rediscount[13], reductions[13], unmortised[13], eruditions[11]

9 letter words

meniscoid[14], miscoined[14], crimsoned[14], misdirect[14], dicrotism[14], indecorum[14], oncidiums[14], midcourse[14], ctenidium[14], documents[14], semitonic[13], cretinism[13], eroticism[13], isometric[13], intercoms[13], criminous[13], costumier[13], cretinoid[12], direction[12], indicters[12], reindicts[12], siderotic[12], centroids[12], doctrines[12], indictors[12], modernist[12], cinderous[12], coinsured[12], decurions[12], semiround[12], introduce[12], reduction[12], cutinised[12], eductions[12], seduction[12], suctioned[12], crudities[12], diuretics[12], incrusted[12], reinducts[12], rudiments[12], courtside[12], misrouted[12], trisodium[12], construed[12], inductors[12], undermost[12], corneitis[11], misorient[11], neuritics[11], countries[11], cretinous[11], neurotics[11], unmortise[11], routinism[11], disorient[10], retinoids[10], erudition[10], disuniter[10], detrusion[10]

8 letter words

dioecism[13], dimetric[13], morticed[13], miscited[13], demotics[13], domestic[13], conidium[13], mucinoid[13], oncidium[13], consumed[13], decorums[13], document[13], costumed[13], creminis[12], isomeric[12], incomers[12], sermonic[12], intercom[12], minciest[12], comities[12], semiotic[12], centimos[12], monistic[12], nomistic[12], meristic[12], scimiter[12], trisemic[12], centrism[12], mortices[12], trisomic[12], urinemic[12], numerics[12], consumer[12], mucrones[12], miscount[12], centrums[12], decision[11], dominies[11], consider[11], crinoids[11], midirons[11], indicter[11], indirect[11], reindict[11], diriment[11], centroid[11], doctrine[11], indictor[11], dormient[11], dictions[11], demonist[11], cordites[11], mortised[11], mordents[11], decurion[11], diecious[11], inducers[11], sciuroid[11], dimerous[11], crunodes[11], mutinied[11], eduction[11], diuretic[11], reinduct[11], rudiment[11], unmitred[11], outcried[11], cornuted[11], trounced[11], inductor[11], mistuned[11], contused[11], conduits[11], discount[11], noctuids[11], demounts[11], mudstone[11], dismount[11], crudites[11], curdiest[11], curtsied[11], diestrum[11], recision[10], soricine[10], citrines[10], crinites[10], inciters[10], interims[10], minister[10], misinter[10], cointers[10], corniest[10], noticers[10], crostini[10], incisure[10], sciurine[10], coinsure[10], monsieur[10], neuritic[10], neurotic[10], unerotic[10], cutinise[10], mutinies[10], counties[10], derision[9], ironside[9], resinoid[9], retinoid[9], editions[9], sedition[9], disinter[9], inditers[9], nitrides[9], diorites[9], uridines[9], dourines[9], sourdine[9], untidier[9], disunite[9], nudities[9], untidies[9], intrudes[9], neuritis[8]