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

15 letter words

glamorousnesses[18]

13 letter words

glamorousness[16], amorousnesses[15]

12 letter words

lemongrasses[15]

11 letter words

amorousness[13], gaseousness[12]

10 letter words

mesogloeas[13], lemongrass[13], glumnesses[13], smugnesses[13], salesrooms[12], moroseness[12], molasseses[12], sloganeers[11], granuloses[11], sunglasses[11], reasonless[10], seasonless[10], sournesses[10]

9 letter words

mesogloea[12], mesogleas[12], sonograms[12], glossemes[12], gossamers[12], glamorous[12], mungooses[12], messuages[12], melanoses[11], lonesomes[11], salerooms[11], salesroom[11], usernames[11], reassumes[11], masseuses[11], sloganeer[10], gasolenes[10], angerless[10], largeness[10], regalness[10], largesses[10], reglosses[10], engrosses[10], grassless[10], grossness[10], granulose[10], erogenous[10], angeluses[10], sugarless[10], roseslugs[10], looseners[9], looseness[9], reseasons[9], seasoners[9], aleurones[9]

8 letter words

melanges[11], mesoglea[11], longsome[11], gleamers[11], manglers[11], gomerals[11], gomerels[11], mongrels[11], moorages[11], legrooms[11], sonogram[11], gameness[11], glassmen[11], glosseme[11], gossamer[11], gormless[11], megasses[11], messages[11], smogless[11], moulages[11], mungoose[11], gruesome[11], glamours[11], organums[11], gunrooms[11], messuage[11], glumness[11], smugness[11], lonesome[10], oenomels[10], almoners[10], solemner[10], saleroom[10], lameness[10], maleness[10], maneless[10], nameless[10], salesmen[10], anemoses[10], someones[10], moonless[10], moreness[10], normless[10], seamless[10], sameness[10], molasses[10], morasses[10], massless[10], melanous[10], username[10], mensural[10], numerals[10], ramulose[10], enamours[10], neuromas[10], enormous[10], solanums[10], measures[10], reassume[10], surnames[10], sunrooms[10], masseuse[10], assumers[10], masseurs[10], gasolene[9], enlarges[9], generals[9], gleaners[9], aerogels[9], oreganos[9], eelgrass[9], gearless[9], largesse[9], regosols[9], sageness[9], songless[9], ogresses[9], glossers[9], euglenas[9], angulose[9], eugenols[9], leaguers[9], granules[9], generous[9], languors[9], loungers[9], rungless[9], roseslug[9], surgeons[9], sunglass[9], guessers[9], loosener[8], enolases[8], realness[8], reseason[8], seasoner[8], aerosols[8], roseolas[8], noseless[8], soleness[8], lassoers[8], soreness[8], reassess[8], assessor[8], aleurone[8], aureoles[8], aleurons[8], neurosal[8], selenous[8], unlooses[8], anureses[8], anserous[8], arsenous[8], neuroses[8], arsonous[8], soleuses[8], sureness[8], sourness[8]

7 letter words

gleeman[10], melange[10], gleamer[10], germane[10], mangler[10], glomera[10], gomeral[10], gomerel[10], marengo[10], megaron[10], mongrel[10], moorage[10], legroom[10], maneges[10], menages[10], mangels[10], mangles[10], oenomel[9], almoner[9], enamels[9], melenas[9], enlarge[8], general[8], gleaner[8], aerogel[8], erelong[8], oregano[8], enolase[7]