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

15 letter words

garrulousnesses[16]

13 letter words

garrulousness[14]

11 letter words

gaseousness[12], usualnesses[11]

10 letter words

sloganeers[11], engrossers[11], granuloses[11], grossulars[11], sunglasses[11], reasonless[10], seasonless[10], sournesses[10]

9 letter words

sloganeer[10], enlargers[10], gasolenes[10], angerless[10], largeness[10], regalness[10], engrosser[10], largesses[10], reglosses[10], engrosses[10], grassless[10], grossness[10], granulose[10], angeluses[10], grossular[10], sugarless[10], roseslugs[10], longueurs[10], garrulous[10], reguluses[10], reasoners[9], reseasons[9], seasoners[9], aleurones[9], rearouses[9], reassures[9], usualness[9], rousseaus[9]

8 letter words

enlarger[9], gasolene[9], enlarges[9], generals[9], gleaners[9], aerogels[9], regalers[9], groaners[9], eelgrass[9], gearless[9], largesse[9], greasers[9], sageness[9], songless[9], ogresses[9], glossers[9], grossers[9], euglenas[9], angulose[9], eugenols[9], leaguers[9], granules[9], generous[9], languors[9], loungers[9], reargues[9], regulars[9], gruelers[9], rungless[9], roseslug[9], surgeons[9], sugarers[9], resurges[9], grousers[9], sunglass[9], guessers[9], longueur[9], angulous[9], rugulose[9], augurers[9], learners[8], relearns[8], reasoner[8], enolases[8], realness[8], reseason[8], seasoner[8], rareness[8], snarlers[8], serranos[8], noseless[8], soleness[8], lassoers[8], soreness[8], reassess[8], assessor[8], aleurone[8], aureoles[8], aleurons[8], neurosal[8], rearouse[8], selenous[8], anureses[8], anserous[8], arsenous[8], neuroses[8], erasures[8], reassure[8], ensurers[8], arousers[8], soleuses[8], sureness[8], sourness[8], assurers[8], assurors[8], neurulae[8], neurular[8], neurulas[8], rouleaus[8], nauseous[8], uraeuses[8], rousseau[8], sensuous[8]

7 letter words

enlarge[8], general[8], gleaner[8], aerogel[8], erelong[8], regaler[8], groaner[8], galeres[8], regales[8], enrages[8], anglers[8], galores[8], gaolers[8], onagers[8], oranges[8], longers[8], greaser[8], regears[8], garners[8], rangers[8], garrons[8], ageless[8], senegas[8], glossae[8], egoless[8], slogans[8], greases[8], largess[8], sangers[8], glosser[8], regloss[8], sarongs[8], engross[8], regress[8], sergers[8], grosser[8], gasless[8], glasses[8], gessoes[8], glossas[8], glosses[8], gossans[8], learner[7], relearn[7], enolase[7], leaners[7], areoles[7], arenose[7], loaners[7], reloans[7], earners[7], reearns[7], snarler[7], serrano[7], earless[7], leasers[7], resales[7], reseals[7], sealers[7], serosae[7], lassoer[7], oarless[7], serosal[7], resoles[7], reasons[7], senoras[7], senores[7], erasers[7], snarers[7], soarers[7], sorrels[7], snorers[7], sorners[7], lessens[7], lassoes[7], loesses[7], seasons[7]