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From letters W, A, T, E, R, I, S, H, N, E, S, S, E, S  I made following words

14 letter words

waterishnesses[20]

13 letter words

swarthinesses[19]

12 letter words

waterishness[18], earthinesses[15], heartinesses[15], trashinesses[15], earwitnesses[15], waterinesses[15], sweatinesses[15]

11 letter words

washinesses[17], whitenesses[17], swarthiness[17], hastinesses[14], wearinesses[14], westernises[14], swartnesses[14], iratenesses[11], tearinesses[11], artsinesses[11]

10 letter words

enwreathes[16], whatnesses[16], ashinesses[13], rashnesses[13], earthiness[13], heartiness[13], trashiness[13], esthesises[13], warinesses[13], wisenesses[13], earwitness[13], wateriness[13], westernise[13], sweatiness[13], waitresses[13], witnessers[13], easinesses[10], artinesses[10]

9 letter words

whereases[15], washiness[15], enwreathe[15], waterhens[15], whiteners[15], enswathes[15], inswathes[15], whiteness[15], whatsises[15], heiresses[12], harnesses[12], sheerness[12], herniates[12], asthenies[12], sheeniest[12], hasteners[12], tarnishes[12], esthesias[12], hastiness[12], weariness[12], waenesses[12], rawnesses[12], wiseasses[12], weensiest[12], wasteries[12], witnesser[12], sweetness[12], wetnesses[12], witnesses[12], swartness[12], arsenites[9], irateness[9], resinates[9], stearines[9], teariness[9], eternises[9], sneeriest[9], esterases[9], assenters[9], sarsenets[9], terseness[9], artsiness[9], assisters[9]

8 letter words

rewashes[14], swashers[14], swishers[14], waterhen[14], wreathen[14], whitener[14], enswathe[14], wheatens[14], inswathe[14], weathers[14], wreathes[14], waterish[14], washiest[14], sweetish[14], whatness[14], swathers[14], trishaws[14], swithers[14], sheenier[11], sheenies[11], heresies[11], reshines[11], sneeshes[11], ashiness[11], hessians[11], rashness[11], herniate[11], hearties[11], hastener[11], heartens[11], hairnets[11], inearths[11], therians[11], esthesia[11], antheses[11], anthesis[11], shanties[11], sheitans[11], sthenias[11], sheerest[11], sheeters[11], heisters[11], estheses[11], esthesis[11], hessites[11], weensier[11], sweenies[11], wariness[11], wiseness[11], tweenies[11], weeniest[11], sweatier[11], wasterie[11], weariest[11], tweeners[11], tinwares[11], sweeties[11], sweetens[11], tweeness[11], newsiest[11], sweaters[11], waisters[11], waitress[11], wastries[11], westerns[11], eeriness[8], eserines[8], easiness[8], reassess[8], eateries[8], serenate[8], arenites[8], arsenite[8], resinate[8], stearine[8], trainees[8], eternise[8], teensier[8], etesians[8], teniases[8], esterase[8], tesserae[8], seriates[8], assenter[8], earnests[8], sarsenet[8], serenest[8], artiness[8], retsinas[8], stainers[8], stearins[8], sentries[8], sensates[8], sestinas[8], sestines[8], assister[8], sarsnets[8], sassiest[8], strasses[8], stresses[8]

7 letter words

herniae[10], sheenie[10], hernias[10], henries[10], inheres[10], reshine[10], hessian[10], hearses[10], heiress[10], harness[10], arshins[10], shairns[10], shiners[10], shrines[10], eserine[7], serenes[7], arsines[7], seiners[7], sereins[7], serines[7]