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From letters A, G, G, L, U, T, I, N, A, T, I, O, N  I made following words

13 letter words

agglutination[15]

10 letter words

tailgating[12], angulating[12], agglutinin[12], outgaining[12], angulation[11], nutational[10]

9 letter words

antiaging[11], agitating[11], attaining[10], agitation[10], outlining[10], tuitional[9]

8 letter words

aligning[10], ganglion[10], ligating[10], antigang[10], tangling[10], glinting[10], tingling[10], tagalong[10], gloating[10], tangoing[10], ingoting[10], lounging[10], glouting[10], tonguing[10], glutting[10], guttling[10], intaglio[9], ligation[9], agnation[9], litigant[9], tainting[9], totaling[9], notating[9], iguanian[9], inguinal[9], nonguilt[9], attuning[9], nutating[9], taunting[9], national[8], natation[8], lunation[8], nutation[8]

7 letter words

ganglia[9], gaining[9], angling[9], gaoling[9], goaling[9], ingoing[9], longing[9], gaiting[9], tanging[9], tinging[9], gigaton[9], tonging[9], taggant[9], gitting[9], guiling[9], unaging[9], lunging[9], gutting[9], anginal[8], alining[8], nailing[8], logania[8], loaning[8], ignatia[8], intagli[8], tailing[8], linting[8], otalgia[8], antilog[8], toiling[8], atoning[8], tilting[8], titling[8], tinting[8], agitato[8], toiting[8], lotting[8], antigun[8], uniting[8], lunting[8], autoing[8], outgain[8], louting[8], tauting[8], nutting[8], touting[8], glutton[8], alation[7], antlion[7], nitinol[7], titania[7], annatto[7], nautili[7], outlain[7], tuition[7]

6 letter words

gingal[8], galago[8], loggia[8], ogling[8], noggin[8], gating[8], giglot[8], gluing[8], luging[8], agnail[7], ailing[7], nilgai[7], angina[7], lignan[7], lignin[7], lining[7], laogai[7], agonal[7], analog[7], oiling[7], goanna[7], longan[7], tiling[7], anting[7], tining[7], galiot[7], latigo[7], gitano[7], tiglon[7], toling[7], noting[7], toning[7], gittin[7], toting[7], iguana[7], laguna[7], lingua[7], nilgau[7], guanin[7], lungan[7], lanugo[7], luting[7], tuning[7], agouti[7], nougat[7], outing[7], tautog[7], alanin[6], anilin[6], latina[6], atonia[6], atonal[6], latino[6], talion[6], anoint[6], nation[6], attain[6], titian[6], lattin[6], natant[6], anatto[6], annual[6], annuli[6], unnail[6], inulin[6], nounal[6], intuit[6], nutant[6]

5 letter words

aging[7], going[7], again[6], alang[6], lagan[6], algin[6], align[6], liang[6], ligan[6], linga[6], logia[6], gonia[6], along[6], anglo[6], logan[6], lingo[6], login[6], agita[6], taiga[6], tanga[6], giant[6], aalii[5], lanai[5], liana[5], annal[5], linin[5], aioli[5], aloin[5], anion[5], inion[5], litai[5]