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From letters W, A, P, P, E, N, S, C, H, A, W, I, N, G, S  I made following words

15 letter words

wappenschawings[31]

14 letter words

wappenschawing[30]

10 letter words

happenings[18]

9 letter words

spaceship[18], happening[17], chainsaws[17], shwanpans[17], spinaches[16], happiness[16], encashing[15], enchasing[15], chasseing[15], wingspans[15], appeasing[14], nappiness[13], paganises[12], naissance[11]

8 letter words

whapping[19], whipsawn[19], whipsaws[19], chapping[18], chappies[17], schappes[17], sapphics[17], schnapps[17], wenching[17], chinwags[17], pshawing[17], peaching[16], chainsaw[16], shwanpan[16], swapping[16], panaches[15], painches[15], cappings[15], paphians[15], aphasics[15], snappish[15], shippens[15], swashing[15], washings[15], ganaches[14], paganish[14], papacies[14], chasings[14], sphinges[14], pawnages[14], spawning[14], wingspan[14], enchains[13], escaping[13], genipaps[13], snapping[13], achiness[13], saphenas[13], spacings[13], winesaps[13], swanpans[13], anhingas[12], pinnaces[12], nighness[12], capiases[12], inscapes[12], pinesaps[12], wanigans[12], encasing[11], paganise[11], sneaping[11], speaning[11], caginess[11], shannies[11], spaeings[11], spinages[11]

7 letter words

whipsaw[18], pawpaws[17], chappie[16], schappe[16], sapphic[16], chawing[16], chinwag[16], chewing[16], peching[15], happing[15], wapping[15], winches[15], cashaws[15], cashews[15], waspish[15], panache[14], capping[14], paphian[14], apaches[14], aphasic[14], pechans[14], spinach[14], pinches[14], sphenic[14], happens[14], shippen[14], schnaps[14], shnapps[14], shawing[14], washing[14], shewing[14], whinges[14], ganache[13], heaping[13], changes[13], cashing[13], chasing[13], hasping[13], pashing[13], phasing[13], shaping[13], pawnage[13], pawning[13], wahines[13], wennish[13], spewing[13], enchain[12], agapeic[12], peacing[12], genipap[12], napping[12], chaines[12], saphena[12], scaping[12], spacing[12], inphase[12], pipages[12], sapping[12], pigpens[12], chaises[12], ashcans[12], aphesis[12], hipness[12], winesap[12], swanpan[12], anhinga[11], pinnace[11], canapes[11], inscape[11], papains[11], nappies[11], pinesap[11], geishas[11], gnashes[11], sashing[11], pepsins[11], wanigan[11], weaning[11], wangans[11], awnings[11], snawing[11], asswage[11], sewings[11], swinges[11], ceasing[10], incages[10], censing[10], spaeing[10], spinage[10], pangens[10], penangs[10], pinangs[10], casings[10], cessing[10], hessian[10], passage[10], passing[10], seawans[10], wanness[10], canines[9], encinas[9], nancies[9], paesani[9], cassena[9], cassina[9], caseins[9], cassine[9], incases[9], paesans[9], paisans[9], pansies[9], sapiens[9], inspans[9], anginas[8], innages[8], assegai[8], ensigns[8], sensing[8], siennas[7]

6 letter words

change[12], aching[12], eching[12], chaine[11], aahing[10], haeing[10], incage[9], canine[8]