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From letters G, R, A, T, U, I, T, O, U, S, N, E, S, S  I made following words

14 letter words

gratuitousness[15]

11 letter words

russettings[12], stegosaurus[12]

10 letter words

ringtosses[11], gestations[11], signatures[11], nutgrasses[11], russetings[11], stegosaurs[11], outstaring[11], gustations[11], russetting[11], augustness[11], gratuitous[11], assertions[10], restations[10], stationers[10], antistress[10], resistants[10], straitness[10], sustainers[10], tessituras[10], trustiness[10], trousseaus[10], auteurists[10]

9 letter words

organises[10], assigners[10], reassigns[10], assignors[10], orangiest[10], agonistes[10], asserting[10], astringes[10], ganisters[10], estragons[10], assorting[10], organists[10], staginess[10], grassiest[10], stressing[10], songsters[10], gestation[10], restating[10], retasting[10], tetragons[10], strangest[10], strongest[10], gauntries[10], signature[10], argentous[10], outranges[10], goutiness[10], sugariest[10], assurgent[10], russeting[10], stegosaur[10], sturgeons[10], gustiness[10], gutsiness[10], outgasses[10], trussings[10], outeating[10], outrating[10], gustation[10], tutorages[10], groutiest[10], outargues[10], augustest[10], assertion[9], senoritas[9], artsiness[9], assentors[9], starnoses[9], arsonists[9], restation[9], stationer[9], resistant[9], straitens[9], tartiness[9], strontias[9], tenorists[9], tastiness[9], arsenious[9], ossuaries[9], sustainer[9], outraises[9], sautoires[9], anestrous[9], rustiness[9], ossatures[9], snoutiest[9], sostenuti[9], tessitura[9], antirusts[9], naturists[9], ruttiness[9], outstares[9], seatrouts[9], touristas[9], stoutness[9], unserious[9], rousseaus[9], trousseau[9], strenuous[9], untrusses[9], autunites[9], auteurist[9], unitrusts[9]

8 letter words

organise[9], agonises[9], assigner[9], reassign[9], seringas[9], argosies[9], assignor[9], signoras[9], soarings[9], goriness[9], angriest[9], astringe[9], ganister[9], gantries[9], granites[9], ingrates[9], rangiest[9], estragon[9], negators[9], organist[9], roasting[9], genitors[9], eastings[9], giantess[9], seatings[9], agonists[9], stranges[9], gastrins[9], stingers[9], trigness[9], storages[9], orgiasts[9], gorsiest[9], strigose[9], songster[9], ringtoss[9], gassiest[9], gastness[9], grossest[9], gnattier[9], treating[9], tetragon[9], rotating[9], estating[9], tangiest[9], toasting[9], starting[9], gitterns[9], garottes[9], stagiest[9], settings[9], egotists[9], erasions[8], sensoria[8], rosiness[8], notaries[8], senorita[8], astonies[8], artiness[8], retsinas[8], stainers[8], stearins[8], assentor[8], santeros[8], senators[8], starnose[8], treasons[8], arsonist[8], oestrins[8], sestinas[8], sonsiest[8], stenosis[8], assister[8], sarsnets[8], ossetras[8], assistor[8], tentoria[8], intreats[8], nitrates[8], straiten[8], tertians[8], toastier[8], strontia[8], snottier[8], tenorist[8], tritones[8], antsiest[8], instates[8], nastiest[8], satinets[8], titaness[8], stations[8]