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From letters W, E, L, T, A, N, S, C, H, A, U, U, N, G, S  I made following words

15 letter words

weltanschauungs[24]

14 letter words

weltanschauung[23]

10 letter words

acanthuses[15], stagnances[13], cannulates[12]

9 letter words

chantages[15], unswathes[15], alcahests[14], eulachans[14], unlatches[14], staunches[14], langshans[13], hangnests[13], shantungs[13], stagnance[12], cannulate[11], canulates[11], angulates[10], untangles[10], gauntness[10], ungulates[10], nauseants[9], annuluses[9]

8 letter words

swatches[16], thalwegs[15], ganaches[14], chantage[14], glunches[14], gauchest[14], claughts[14], uncaught[14], thawless[14], whatness[14], unswathe[14], channels[13], calashes[13], alcahest[13], enchants[13], satchels[13], slatches[13], chastens[13], snatches[13], stanches[13], eulachan[13], launches[13], chunnels[13], anchusas[13], chateaus[13], calathus[13], acanthus[13], nautches[13], unchaste[13], newscast[13], langshan[12], thanages[12], hangnest[12], stengahs[12], haulages[12], shantung[12], wantages[12], twangles[12], wastages[12], gunwales[12], scalages[11], nathless[11], unlashes[11], scutages[11], seawants[11], analects[10], lactases[10], cannulae[10], cannulas[10], scalenus[10], canulate[10], lacunate[10], tenacula[10], cutlases[10], nutcases[10], usaunces[10], cultuses[10], lasagnes[9], tannages[9], guanases[9], angulate[9], untangle[9], languets[9], tunnages[9], ungulate[9], unguenta[9], unguents[9], sealants[8], annulate[8], nauseant[8], annulets[8], sultanas[8]

7 letter words

ganache[13], changes[13], gulches[13], channel[12], clashes[12], ashcans[12], chaetal[12], canthal[12], enchant[12], chalets[12], latches[12], satchel[12], chasten[12], sachets[12], scathes[12], chunnel[12], anchusa[12], nuchals[12], lunches[12], gnashes[11], thanage[11], gnathal[11], stengah[11], lengths[11], gashest[11], haulage[11], unhangs[11], scalage[10], glances[10], hansels[10], altheas[10], hantles[10], haslets[10], hatless[10], sheltas[10], hastens[10], snathes[10], cangues[10], uncages[10], glucans[10], unleash[10], hausens[10], anlaces[9], cannels[9], calesas[9], cassena[9], lactean[9], acetals[9], lactase[9], catenas[9], cantals[9], cantles[9], centals[9], lancets[9], nascent[9], castles[9], ascents[9], secants[9], stances[9], canulae[9], lacunae[9], cannula[9], unclean[9], canulas[9], lacunas[9], censual[9], lacunes[9], launces[9], unlaces[9], nuances[9], nuncles[9], casuals[9], causals[9], clauses[9], uncases[9], usances[9], anlagen[8], anlages[8], galenas[8], lasagne[8], tannage[8], agnates[8], gelants[8], tangles[8], gannets[8], stalags[8], satangs[8], guanase[8], lagunas[8], angelus[8], lagunes[8], langues[8], lungans[8], gunnels[8], assuage[8], sausage[8], anneals[7], anlases[7], sealant[7], annates[7], atlases[7], annuals[7], nauseas[7], sensual[7], unseals[7]