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From letters P, R, E, N, O, T, I, F, I, C, A, T, I, O, N  I made following words

15 letter words

prenotification[22]

13 letter words

pontification[20], petrification[20]

12 letter words

petrifaction[19], pontificator[19], notification[17], antifriction[17], antientropic[16]

11 letter words

pontificate[18], reification[16], fornication[16], nonoperatic[15], pectination[15], crepitation[15], contraption[15], interaction[13], itineration[11], orientation[11]

10 letter words

proficient[17], infarction[15], infraction[15], oceanfront[15], fortepiano[15], pianoforte[15], antipoetic[14], pentatonic[14], protection[14], interionic[12], incitation[12], antierotic[12], recitation[12], contrition[12], tripinnate[12], interpoint[12], antiproton[12]

9 letter words

opacifier[16], financier[14], infection[14], fornicate[14], confiteor[14], nonfactor[14], nonprofit[14], infectant[14], footprint[14], incipient[13], inception[13], nonpoetic[13], proteinic[13], proaction[13], neotropic[13], inotropic[13], crepitant[13], parotitic[13], patriotic[13], entoproct[13], afternoon[12], carnitine[11], container[11], crenation[11], incretion[11], nonerotic[11], operation[11], pronation[11], entropion[11], pontonier[11], prenotion[11], nictation[11], inpatient[11], panettoni[11], intricate[11], carnotite[11], tricotine[11], partition[11], protonate[11], itinerant[9], iteration[9], initiator[9], nitration[9], tretinoin[9]

8 letter words

pacifier[15], pontific[15], footpace[15], confiner[13], pinafore[13], artifice[13], fraction[13], infector[13], friction[13], footrace[13], confront[13], aperitif[13], confetti[13], confetto[13], trifecta[13], apocrine[12], caponier[12], procaine[12], pecorini[12], picaroon[12], pecorino[12], cornpone[12], optician[12], operatic[12], periotic[12], coparent[12], portance[12], entropic[12], inceptor[12], copatron[12], protonic[12], pittance[12], protatic[12], infinite[11], notifier[11], fetation[11], inaction[10], cotinine[10], nicotine[10], conation[10], citrinin[10], actioner[10], anoretic[10], creation[10], reaction[10], coronate[10], nonactor[10], paintier[10], atropine[10], pointier[10], antiporn[10], troponin[10], incitant[10], taconite[10], citation[10], cotenant[10], petition[10], patootie[10], potation[10], interact[10], traction[10], contrite[10], corotate[10], triptane[10], patentor[10], triennia[8], anointer[8], reanoint[8], initiate[8], intonate[8], notation[8], intranet[8], tentoria[8], antiriot[8], rotation[8]

7 letter words

finance[12], confine[12], fancier[12], orifice[12], coinfer[12], conifer[12], firepan[12], profane[12], faction[12], fiction[12], nonfact[12], pinnace[11], apnoeic[11], caprine[11], porcine[11], porcini[11], porcino[11], picante[11], finnier[10], inferno[10], infante[10], fontina[10], anionic[9], coniine[9], epinaoi[9], opinion[9], cannier[9], narcein[9], cinerin[9], oneiric[9], coronae[9], noncore[9], ripieni[9], pannier[9], ripieno[9], prenoon[9], ancient[9], aconite[9], connate[9], actinon[9], contain[9], nicotin[9], coontie[9], coition[9], connote[9], enation[7]