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From letters X, E, N, O, D, I, A, G, N, O, S, T, I, C  I made following words

14 letter words

xenodiagnostic[25]

11 letter words

indexations[19], designation[13]

10 letter words

exscinding[21], coexisting[20], indexation[18], exodontias[18], oxidations[18], endotoxins[18], descanting[14], discanting[14], distancing[14], diagnostic[14], eicosanoid[13], sanctioned[13], incognitas[13], sonicating[13], sectioning[13], anticodons[13], cognations[13], contagions[13], congestion[13], conditions[13], cognitions[13], incognitos[13], destaining[12], sonication[12], isoantigen[11]

9 letter words

toxigenic[19], endotoxic[19], coxitides[19], indexings[18], oxidating[18], nonexotic[18], exactions[18], exodontia[17], oxidation[17], endotoxin[17], deaconing[13], ascending[13], consigned[13], seconding[13], decanting[13], coediting[13], ionogenic[12], sciaenoid[12], canonised[12], antigenic[12], contained[12], incondite[12], incognita[12], anticodon[12], cognation[12], contagion[12], ontogenic[12], condition[12], cognition[12], incognito[12], actinides[12], andesitic[12], indicates[12], instanced[12], indicants[12], incidents[12], dacoities[12], catenoids[12], sonicated[12], actinoids[12], agonistic[12], diosgenin[11], detaining[11], destining[11], indigents[11], digestion[11], inactions[11], onanistic[11], cotinines[11], nicotines[11], isooctane[11], conations[11], ideations[10], iodinates[10], antinodes[10], negations[10], nidations[10], ingestion[10], iodations[10], donations[10], noontides[10], antinoise[9]

8 letter words

encoding[12], scending[12], decagons[12], codesign[12], cognised[12], cosigned[12], discoing[12], cantdogs[12], canoeing[11], conidian[11], anconoid[11], sciaenid[11], encasing[11], indicans[11], incasing[11], codeinas[11], diocesan[11], coinages[11], decision[11], isogenic[11], nonacids[11], isogonic[11], condones[11], actinide[11], ctenidia[11], indicate[11], incanted[11], enacting[11], indicant[11], incident[11], enticing[11], catenoid[11], actinoid[11], diatonic[11], cantoned[11], noticing[11], connoted[11], distance[11], scandent[11], scanting[11], scenting[11], egoistic[11], endocast[11], tacnodes[11], coagents[11], cognates[11], agnostic[11], coasting[11], coatings[11], cotingas[11], escoting[11], dictions[11], contends[11], indigens[10], agonised[10], diagnose[10], indigoes[10], canonise[10], coniines[10], oscinine[10], snooding[10], ideating[10], nidating[10], enditing[10], indigent[10], iodating[10], donating[10], denoting[10], inaction[10], cotinine[10], nicotine[10], conation[10], sedating[10], steading[10], canities[10], dingiest[10], ancients[10], canniest[10], insectan[10], instance[10], standing[10], godetias[10], aconites[10], canoeist[10], sonicate[10], sanidine[9], anginose[9], ionogens[9], ideation[9], iodinate[9], anointed[9], antinode[9], negation[9], nidation[9], iodation[9], donation[9], noontide[9], adenitis[9], dainties[9], antigens[9], gentians[9], sainting[9], staining[9], ginniest[9], astonied[9], sedation[9], editions[9], sedition[9], negatons[9], tonnages[9]