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

15 letter words

antispeculative[22]

11 letter words

speculative[18], inactivates[16], vaticinates[16], vulcanisate[16], anticipates[15], encapsulate[15], petulancies[15], capitulates[15], licentiates[13], actualities[13]

10 letter words

inceptives[17], inspective[17], captivates[17], valiancies[15], inactivate[15], vaticinate[15], vesiculate[15], vulcanites[15], cultivates[15], capitalise[14], tailpieces[14], analeptics[14], plasticene[14], plasticine[14], anticipate[14], capitalist[14], antiseptic[14], psittacine[14], paniculate[14], petulances[14], inculpates[14], capitulate[14], venalities[13], ventilates[13], penalities[12], licentiate[12], tenacities[12], austenitic[12], natalities[10], antielites[10]

9 letter words

placative[16], inceptive[16], captivate[16], valencias[14], valiances[14], valencies[14], venatical[14], vaticinal[14], plaintive[14], viaticals[14], calvities[14], cavaletti[14], activates[14], cavitates[14], atavistic[14], vesiculae[14], vulcanise[14], inclusive[14], vulcanite[14], pulvinate[14], evacuates[14], causative[14], vacuities[14], evacuants[14], pulsative[14], cultivate[14], pleasance[13], cisalpine[13], pliancies[13], tailpiece[13], placentae[13], analeptic[13], ancipital[13], anapestic[13], patencies[13], patiences[13], epinastic[13], placentas[13], pentacles[13], splenetic[13], cisplatin[13], pectinate[13], epistatic[13], pancettas[13], pittances[13], encapsule[13], apiculate[13], petulance[13], inculpate[13], auspicate[13], paucities[13], aspectual[13], capsulate[13], peculates[13], speculate[13], euplastic[13], spiculate[13], centuples[13], catapults[13], naiveties[12], aventails[12], lenitives[12], ventilate[12], aestivate[12], levitates[12], tantivies[12], evaluates[12], eluviates[12], veinulets[12], vaultiest[12], laciniate[11], caseinate[11], analcites[11], anelastic[11], laitances[11], latencies[11], inelastic[11], sciential[11], insectile[11], selenitic[11], apetalies[11], panetelas[11], palatines[11], antisleep[11], penalties[11], tapelines[11], tetanical[11], catenates[11], testacean[11], tentacles[11], patinates[11], antipasti[11], paintiest[11], pantalets[11], tinplates[11], pestilent[11], canulates[11], nucleates[11], tunicates[11], anticults[11], spatulate[11], stipulate[11], alienates[9], analities[9], antielite[9], insatiate[9], tantalise[9], austenite[9], uintaites[9], tenuities[9], sultanate[9], auntliest[9], intitules[9]

8 letter words

calipees[12], especial[12], sapience[12], piscinae[12], capelans[12], scalepan[12], calpains[12], capelins[12], panicles[12], pelicans[12], piscinal[12], penicils[12], patience[12], placenta[12], pentacle[12], platinic[12], canalise[10], salience[10], salicine[10], seaplane[10], spelaean[10], penalise[10], sepaline[10], actiniae[10], analcite[10], laitance[10], panetela[10], palatine[10], petaline[10], tapeline[10], escalate[10], ciliates[10], silicate[10], estancia[10], cineaste[10], actinias[10], canities[10], niceties[10], analects[10], cleanest[10], santalic[10], canistel[10], centiles[10], alienate[8], alienist[8], litanies[8]