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From letters A, M, O, R, P, H, O, U, S, N, E, S, S, E, S  I made following words

15 letter words

amorphousnesses[22]

13 letter words

amorphousness[20], amorousnesses[15]

12 letter words

housepersons[17], porousnesses[14]

11 letter words

mesonephros[18], sharpnesses[16], houseperson[16], sousaphones[16], aponeuroses[13], amorousness[13]

10 letter words

pheromones[17], semaphores[17], shampooers[17], noospheres[15], poshnesses[15], sousaphone[15], menopauses[14], mesopauses[14], hoarseness[13], rashnesses[13], moroseness[12], preseasons[12], poornesses[12], sparseness[12], porousness[12], suspensers[12], suspensors[12], sournesses[10]

9 letter words

pheromone[16], semaphore[16], shampooer[16], neomorphs[16], morphoses[16], prehumans[16], amorphous[16], homespuns[16], earphones[14], noosphere[14], rhamnoses[14], nephroses[14], oospheres[14], sharpness[14], saphenous[14], rhamnuses[14], unspheres[14], menopause[13], mesopause[13], responsum[13], harnesses[12], seahorses[12], seashores[12], preseason[11], spareness[11], responses[11], espressos[11], repossess[11], possessor[11], usernames[11], reassumes[11], suspenser[11], espousers[11], repousses[11], suspensor[11], masseuses[11], suspenses[11], surpasses[11], reseasons[9], seasoners[9]

8 letter words

neomorph[15], sheepman[15], phonemes[15], emphases[15], shampoos[15], prehuman[15], homespun[15], smashups[15], earphone[13], horseman[13], menorahs[13], rhamnose[13], horsemen[13], hormones[13], moorhens[13], oosphere[13], harpoons[13], reshapes[13], sharpens[13], pharoses[13], smooshes[13], poshness[13], smashers[13], hereupon[13], houseman[13], housemen[13], unsphere[13], euphroes[13], unmeshes[13], shamuses[13], prenames[12], spearmen[12], manropes[12], pressman[12], pressmen[12], prosomas[12], oosperms[12], superman[12], supermen[12], spumones[12], presumes[12], supremes[12], spermous[12], supremos[12], opossums[12], honorees[11], seahorse[11], seashore[11], hoarsens[11], senhoras[11], senhores[11], rashness[11], rehouses[11], onrushes[11], unhorses[11], rhesuses[11], personae[10], anemoses[10], someones[10], moreness[10], personas[10], responsa[10], response[10], sopranos[10], poorness[10], snoopers[10], sameness[10], morasses[10], asperses[10], repasses[10], espresso[10], sponsors[10], eupnoeas[10], username[10], enamours[10], neuromas[10], enormous[10], measures[10], reassume[10], surnames[10], sunrooms[10], pureness[10], espouser[10], repousse[10], saporous[10], masseuse[10], suspense[10], espouses[10], assumers[10], masseurs[10], soursops[10], passuses[10], reseason[8], seasoner[8], soreness[8], reassess[8], assessor[8], anureses[8], anserous[8], arsenous[8], neuroses[8], arsonous[8], sureness[8], sourness[8]

7 letter words

phoneme[14], shopman[14], phenoms[14], shopmen[14], oompahs[14], shampoo[14], menorah[12], hormone[12], moorhen[12], harpoon[12], peahens[12], hareems[12], prename[11], manrope[11], honoree[10], hoarsen[10], senhora[10], reshone[10], onshore[10], someone[9], meaners[9], renames[9], enamors[9], moaners[9], oarsmen[9], moreens[9], arenose[7]