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From letters G, L, U, C, O, N, E, O, G, E, N, E, S, I, S  I made following words

15 letter words

gluconeogenesis[19]

11 letter words

negligences[15], oncogeneses[14], oncogenesis[14], counselings[14]

10 letter words

negligence[14], consignees[13], counseling[13], oligogenes[12], insolences[12], geognosies[12], cloisonnes[12], counselees[12], sinologues[11]

9 letter words

congeeing[13], oligocene[12], consignee[12], enclosing[12], ecologies[12], oncogenes[12], consoling[12], unclosing[12], censusing[12], oligogene[11], negligees[11], leniences[11], insolence[11], geologies[11], cloisonne[11], licensees[11], legginess[11], colonises[11], eclosions[11], conenoses[11], counselee[11], seclusion[11], enologies[10], neologies[10], loosening[10], lessening[10], lessoning[10], oogeneses[10], oogenesis[10], ensouling[10], sinologue[10], unloosing[10], eulogises[10], isologues[10], isogenous[10], looniness[9], selenious[9], unloosens[9]

8 letter words

geologic[12], cooeeing[11], neologic[11], oncogene[11], clonings[11], colognes[11], cognises[11], closings[11], consigns[11], eugenics[11], eclogues[11], glucoses[11], negligee[10], lenience[10], longeing[10], licensee[10], negliges[10], cineoles[10], longings[10], googlies[10], colonies[10], colonise[10], eclosion[10], conenose[10], glegness[10], licenses[10], silences[10], sniggles[10], gensengs[10], incenses[10], niceness[10], ginsengs[10], colessee[10], solecise[10], senecios[10], encloses[10], incloses[10], glossing[10], goslings[10], singsong[10], conioses[10], consoles[10], coolness[10], lounging[10], segueing[10], leucines[10], nucleins[10], enounces[10], nucleons[10], guessing[10], snuggies[10], snuggles[10], coleuses[10], coulisse[10], clonuses[10], counsels[10], uncloses[10], oogenies[9], ionogens[9], glonoins[9], snooling[9], elegises[9], genoises[9], loginess[9], goneness[9], longness[9], isogones[9], ingenues[9], unseeing[9], eulogies[9], eulogise[9], eugenols[9], ligneous[9], enginous[9], isologue[9], geniuses[9], gluiness[9], ugliness[9], unslings[9], loneness[8], unloosen[8], selenous[8], elusions[8], nonissue[8], unsonsie[8], nounless[8], unlooses[8]

7 letter words

cloning[10], cologne[10], cooling[10], locoing[10], censing[10], congees[10], cognise[10], coignes[10], closing[10], consign[10], congoes[10], neglige[9], cineole[9], longing[9], ongoing[9], license[9], selenic[9], silence[9], leggins[9], niggles[9], sniggle[9], genseng[9], incense[9], ginseng[9], senecio[9], enclose[9], legongs[9], cineols[9], inclose[9], gosling[9], conines[9], noggins[9], coolies[9], gigolos[9], goosing[9], colones[9], console[9], neogene[8], ionogen[8], glonoin[8], elegies[8], elegise[8], seeling[8], engines[8], lensing[8], genoise[8], soignee[8], eloigns[8], legions[8], lingoes[8], longies[8], ologies[8], goonies[8], isogone[8], noogies[8], logions[8], loosing[8], olingos[8], leonine[7], oleines[7], loonies[7]