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From letters P, R, E, P, U, B, L, I, C, A, T, I, O, N, S  I made following words

15 letter words

prepublications[23]

14 letter words

prepublication[22], republications[20]

13 letter words

republication[19], insupportable[19]

12 letter words

subprincipal[20], pilocarpines[18], publications[18], supplication[18], prelibations[16], replications[16], lubrications[16], pertinacious[16], popularities[16]

11 letter words

pilocarpine[17], participles[17], republicans[17], publication[17], unstoppable[17], subtropical[17], precipitous[17], supportable[17], prelibation[15], replication[15], bisectional[15], pratincoles[15], lubrication[15], peculations[15], speculation[15], spiculation[15], inscrutable[15], construable[15], precautions[15], liberations[13], unclarities[13], unrealistic[13], ulcerations[13]

10 letter words

scaloppine[16], principals[16], principles[16], participle[16], epiblastic[16], strippable[16], captoprils[16], republican[16], suppliance[16], porcupines[16], supplicate[16], supplicant[16], populistic[16], supraoptic[16], insociable[14], porcelains[14], piperonals[14], antipolice[14], pratincole[14], cobaltines[14], bilections[14], plasticine[14], speciation[14], neoplastic[14], pleonastic[14], plications[14], inapposite[14], cabriolets[14], biopirates[14], pictorials[14], preobtains[14], ascription[14], isentropic[14], prolactins[14], appointers[14], reappoints[14], unsociable[14], incurables[14], binoculars[14], pernicious[14], preclusion[14], popularise[14], peculation[14], orbiculate[14], precaution[14], prenuptial[14], inculpates[14], bluepoints[14], pleustonic[14], punctilios[14], suppletion[14], lubricates[14], urbanistic[14], subcentral[14], lubricants[14], incubators[14], plicatures[14], blueprints[14], peculators[14], speculator[14], abruptions[14], subreption[14], supertonic[14], supplanter[14], liberation[12], epilations[12], bairnliest[12], nailbiters[12], clarionets[12], librations[12], relictions[12], reptilians[12], polarities[12], ulceration[12], inoculates[12], inosculate[12], licentious[12], urbanities[12], lacustrine[12], obituaries[12], boilersuit[12], cautioners[12], cointreaus[12], recautions[12], nucleators[12], recountals[12], ultrasonic[12]

9 letter words

principal[15], principle[15], pericopal[15], episcopal[15], prebiotic[15], captopril[15], proleptic[15], pantropic[15], porcelain[13], piperonal[13], sibilance[13], balconies[13], cisalpine[13], pliancies[13], epsilonic[13], picolines[13], panoplies[13], irascible[13], albicores[13], bracioles[13], cabrioles[13], carbinols[13], precisian[13], caprioles[13], caponiers[13], procaines[13], proscenia[13], precision[13], panbroils[13], replicons[13], oilpapers[13], incitable[13], cobaltine[13], albinotic[13], bilection[13], pointable[13], plication[13], cabriolet[13], pearlitic[13], printable[13], biopirate[13], precoital[13], pictorial[13], preobtain[13], proteinic[13], prolactin[13], appointer[13], reappoint[13], bisection[13], constable[13], epinastic[13], cisplatin[13], opacities[13], scapolite[13], opticians[13], conepatls[13], tailpipes[13], brasilein[11], acroleins[11], censorial[11], epilation[11], nailbiter[11], aerolitic[11], clarionet[11], libration[11], lictorian[11], reliction[11], reptilian[11], inelastic[11], sciential[11], socialite[11], tailbones[11], coastline[11], sectional[11], libations[11], antipoles[11]