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

13 letter words

xenodiagnosis[22]

10 letter words

diosgenins[12]

9 letter words

indexings[18], diosgenin[11], diseasing[11], dinginess[11], diagnoses[11], diagnosis[11], gneissoid[11], sanidines[10], seasoning[10], isogonies[10]

8 letter words

indexing[17], digoxins[17], dioxanes[16], oxidases[16], oxidises[16], saxonies[15], indigens[10], agonised[10], diagnose[10], indigoes[10], snooding[10], assigned[10], siganids[10], goodness[10], sanidine[9], anginose[9], ionogens[9], adenosis[9], adonises[9], agonises[9], isogones[9], inosines[8]

7 letter words

digoxin[16], dioxane[15], oxidase[15], oxidise[15], dioxans[15], dioxins[15], deaning[9], indigen[9], gonidia[9], siganid[9], dingies[9], sanding[9], endings[9], sending[9], ganoids[9], dingoes[9], indigos[9], goodies[9], noodges[9], designs[9], dissing[9], sidings[9], dosages[9], seadogs[9], dossing[9], godsons[9], ionogen[8], innages[8], saining[8], insigne[8], seining[8], agonies[8], agonise[8], iodines[8], ionised[8], nonages[8], noising[8], goonies[8], isogone[8], noogies[8], nonegos[8], noosing[8], daisies[8], insides[8], seising[8], ensigns[8], sensing[8], iodises[8], nosings[8], isodose[8], isogons[8], asinine[7], inosine[7], ionones[7], siennas[7], ionises[7], nasions[7], sonnies[7]

6 letter words

nixing[14], dioxan[14], dioxin[14], exodoi[14], axised[14], deixis[14], xenias[13], gained[8], aiding[8], dieing[8], ending[8], ginned[8], dining[8], indign[8], niding[8], ganoid[8], indigo[8], goodie[8], noodge[8], deigns[8], design[8], dinges[8], signed[8], singed[8], siding[8], dagoes[8], dosage[8], seadog[8], dogies[8], geoids[8], dongas[8], gonads[8], doings[8], dosing[8], goosed[8], godson[8], gassed[8], innage[7], iodine[7], nonage[7], goonie[7], noogie[7], nonego[7], gonion[7], sained[7], easing[7], indies[7], inside[7], sinned[7], saning[7], ensign[7], iodise[7], anodes[7], agones[7], genoas[7], adonis[7], danios[7], donsie[7], noised[7], onside[7], soigne[7], iodins[7], donnas[7], nosing[7], nodose[7], noosed[7], odeons[7], isogon[7], asides[7], daises[7], dassie[7], diesis[7], sedans[7], assign[7], gneiss[7], singes[7], sondes[7], gossan[7], gnoses[7], segnos[7], gnosis[7], gooses[7], snoods[7], eonian[6], ionone[6], inanes[6], insane[6], sienna[6], ionise[6], anions[6], nasion[6], inions[6], onions[6], anises[6], sanies[6], sansei[6], niseis[6], seisin[6], sennas[6], season[6], enosis[6], eosins[6], essoin[6], noesis[6], noises[6], ossein[6], sonsie[6], nooses[6]