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

14 letter words

epicontinental[18]

11 letter words

pectination[15], continental[13], penitential[13], intentional[11]

10 letter words

antipolice[14], antipoetic[14], pentatonic[14], centennial[12], licentiate[12], actinolite[12]

9 letter words

pennoncel[13], tailpiece[13], plication[13], inception[13], pectinate[13], anticline[11], octennial[11], clintonia[11], epilation[11], pinnation[11], nonpliant[11], nictation[11], continent[11], inpatient[11], petiolate[11], peltation[11], potential[11], panettone[11], panettoni[11], nilpotent[11], lineation[9], antielite[9], intention[9]

8 letter words

pinnacle[12], pliocene[12], picoline[12], pinecone[12], penoncel[12], patience[12], pentacle[12], platinic[12], poetical[12], conepate[12], optician[12], conepatl[12], platonic[12], leptonic[12], pittance[12], cannelon[10], election[10], neotenic[10], inaction[10], cotinine[10], nicotine[10], nonelect[10], innocent[10], petaline[10], tapeline[10], antelope[10], antipole[10], pentanol[10], tentacle[10], incitant[10], taconite[10], citation[10], cotenant[10], tinplate[10], penitent[10], toeplate[10], petition[10], nonelite[8], lenition[8], etiolate[8], intonate[8], nontitle[8]

7 letter words

calipee[11], capelin[11], panicle[11], pelican[11], penicil[11], penance[11], pinnace[11], apnoeic[11], noplace[11], pinocle[11], pleonic[11], cipolin[11], picolin[11], capelet[11], plicate[11], aplitic[11], pelitic[11], picante[11], ectopia[11], picotee[11], polecat[11], capitol[11], coalpit[11], optical[11], topical[11], politic[11], potence[11], caption[11], paction[11], entopic[11], nepotic[11], pectate[11], encinal[9], incline[9], cineole[9], anionic[9], coniine[9], alencon[9], cannoli[9], elapine[9], enplane[9], pennine[9], ninepin[9], epinaoi[9], opaline[9], ciliate[9], centile[9], licente[9], canteen[9], ancient[9], aloetic[9], acetone[9], aconite[9], lactone[9], lection[9], connate[9], actinon[9], contain[9], nicotin[9], epilate[9], pileate[9], pantile[9], penlite[9], pintail[9], pennate[9], pentane[9], pinnate[9], pennant[9], petiole[9], polenta[9], potline[9], topline[9], pinitol[9], pintano[9], pontine[9], lattice[9], tactile[9], nictate[9], tetanic[9], titanic[9], calotte[9], litotic[9], taction[9], tonetic[9], content[9], palette[9], peltate[9], patient[9], paletot[9], talipot[9], potteen[9], antipot[9], aniline[7], leonine[7], lineate[7], lenient[7], elation[7], toenail[7], neonate[7], enation[7], antlion[7], nitinol[7], entitle[7], intitle[7], tontine[7]

6 letter words

enlace[8], inlace[8], canine[8], cannie[8], encina[8], niacin[8], cannel[8], aeonic[8], alnico[8], oilcan[8], cineol[8], enolic[8], ancone[8], conine[8], anilin[6], nannie[6], eolian[6], oleine[6], eonian[6]