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

15 letter words

grandiosenesses[17]

13 letter words

grandioseness[15]

12 letter words

androgeneses[14], androgenesis[14], daringnesses[14], resignedness[14], greasinesses[13]

11 letter words

grandnesses[13], reseasoning[12], readinesses[12], randinesses[12], nerdinesses[12], angrinesses[12], ranginesses[12], sandinesses[12], snidenesses[12], reassessing[12]

10 letter words

endogenies[12], grenadines[12], serenading[12], renegadoes[12], diageneses[12], gesneriads[12], reassigned[12], greediness[12], greensands[12], daringness[12], agednesses[12], edginesses[12], adenosines[11], reseasoned[11], reasonings[11], donenesses[11], gonenesses[11], seasonings[11], dearnesses[11], aridnesses[11], direnesses[11], greasiness[11], egressions[11], gorinesses[11], sagenesses[11], reassessed[11], dressiness[11], nearnesses[10], ironnesses[10], easinesses[10], sanenesses[10], nosinesses[10], sorenesses[10], rosinesses[10]

9 letter words

endearing[11], engrained[11], grenadine[11], nondegree[11], renegades[11], gesneriad[11], energised[11], reseeding[11], endangers[11], greensand[11], engenders[11], resending[11], renegados[11], grandiose[11], organdies[11], organised[11], androgens[11], endorsing[11], designees[11], digeneses[11], geodesies[11], diagnoses[11], degreases[11], disagrees[11], designers[11], redesigns[11], grandness[11], engrossed[11], grandsons[11], degassers[11], dressages[11], digresses[11], dressings[11], adenosine[10], deaneries[10], engineers[10], reasoning[10], neediness[10], seasoning[10], diaereses[10], serenades[10], eagerness[10], arsenides[10], nearsides[10], readiness[10], reediness[10], energises[10], greenness[10], randiness[10], nerdiness[10], angriness[10], ranginess[10], endorsees[10], indorsees[10], organises[10], egression[10], seediness[10], assignees[10], denseness[10], sandiness[10], snideness[10], gneissose[10], rednesses[10], assigners[10], reassigns[10], ingresses[10], sideroses[10], engrosses[10], assignors[10], sadnesses[10], assessing[10], gassiness[10], grossness[10], anserines[9], onenesses[9], reseasons[9], seasoners[9]

8 letter words

renegade[10], regained[10], endanger[10], engender[10], renegado[10], organdie[10], androgen[10], adorning[10], designee[10], agonised[10], diagnose[10], endogens[10], degrease[10], disagree[10], deranges[10], grandees[10], grenades[10], deraigns[10], gradines[10], readings[10], designer[10], energids[10], redesign[10], reedings[10], resigned[10], darnings[10], negroids[10], grandson[10], agedness[10], assigned[10], edginess[10], engineer[9], adenines[9], anginose[9], serenade[9], arsenide[9], nearside[9], nereides[9], redenies[9], anergies[9], gesneria[9], energies[9], energise[9], greenies[9], reseeing[9], ensnared[9], insnared[9], aginners[9], earnings[9], engrains[9], grannies[9], sneering[9], reasoned[9], endorsee[9], aneroids[9], indorsee[9], organise[9], eringoes[9], andirons[9], negronis[9], ageneses[9], aniseeds[9], agenesis[9], assignee[9], adenoses[9], seasoned[9], adenosis[9], adonises[9], agonises[9], genoises[9], anserine[8], raisonne[8]