use '?' for JOKER (blank)

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

15 letter words

nonconstructive[22]

12 letter words

constructive[19], construction[16]

11 letter words

convections[18], conventions[16], coinventors[16], connections[15], concertinos[15], concretions[15], consecution[15], contentions[13], counterions[13], contentious[13]

10 letter words

convincers[17], convection[17], reconvicts[17], convectors[17], conversion[15], convention[15], coinventor[15], coinvestor[15], nonvectors[15], contortive[15], overcounts[15], connection[14], concertino[14], concretion[14], connectors[14], concretist[14], unconcerns[14], nonconcurs[14], outstriven[13], contention[12], continents[12], counterion[12], centurions[12], continuers[12], ecotourist[12], nonroutine[10]

9 letter words

convincer[16], convinces[16], reconvict[16], convector[16], connivers[14], convenors[14], connivent[14], nonvector[14], coinvents[14], contrives[14], vorticose[14], oncovirus[14], overcount[14], contusive[14], outvoices[14], coercions[13], connector[13], corticose[13], creosotic[13], crocoites[13], concertos[13], tectonics[13], constrict[13], unconcern[13], nonconcur[13], concourse[13], cinctures[13], construct[13], inventors[12], nonvoters[12], nonvenous[12], outstrive[12], outstrove[12], nonerotic[11], innocents[11], noninsect[11], cortisone[11], continent[11], cornetist[11], centurion[11], continuer[11], neutronic[11], continues[11], neustonic[11], continuos[11], contusion[11], countries[11], cretinous[11], neurotics[11], nocturnes[11], intercuts[11], tinctures[11], toreutics[11], ironstone[9], serotonin[9], neutrinos[9], trunnions[9], nutrients[9], turnstone[9]

8 letter words

convince[15], conniver[13], convenor[13], connives[13], converso[13], coinvent[13], contrive[13], coercion[12], conciser[12], cornices[12], croceins[12], concerns[12], concerti[12], necrotic[12], crocoite[12], concerto[12], conceits[12], concents[12], connects[12], cortices[12], concerts[12], tectonic[12], cocottes[12], concours[12], cincture[12], coconuts[12], stuccoer[12], environs[11], innocent[10], nontonic[10], coonties[10], connotes[10], cointers[10], corniest[10], noticers[10], coronets[10], crostino[10], contrite[10], stenotic[10], tonetics[10], contents[10], centrist[10], citterns[10], cottiers[10], strontic[10], contorts[10], neuronic[10], inconnus[10], coinsure[10], unicorns[10], corneous[10], continue[10], continuo[10], neurotic[10], unerotic[10], nocturne[10], counties[10], unctions[10], citreous[10], outcries[10], construe[10], counters[10], recounts[10], trounces[10], ructions[10], nocturns[10], ecotours[10], outscore[10], contours[10], cornutos[10], croutons[10], outscorn[10], intercut[10], tincture[10], toreutic[10], instruct[10], noninert[8], intoners[8], ternions[8], snootier[8], notornis[8], tinstone[8], tontines[8], snottier[8], tenorist[8], tritones[8], rootiest[8], tortoise[8], tortonis[8], reunions[8], neutrino[8], trunnion[8], runniest[8], routines[8], snoutier[8], neutrons[8], outsnore[8], nutrient[8], notturni[8], notturno[8], runtiest[8], tortious[8]