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From letters X, E, R, O, P, H, T, H, A, L, M, I, A, S  I made following words

14 letter words

xerophthalmias[31]

13 letter words

xerophthalmia[30]

11 letter words

ophthalmias[21]

10 letter words

ophthalmia[20], parashioth[18], isothermal[15], thimerosal[15], spermatial[14], ametropias[14]

9 letter words

proximate[20], rheotaxis[19], toxaemias[18], postaxial[18], expiators[18], arhatship[17], parashoth[17], hepatomas[16], metaphors[16], apholates[14], atheromas[14], hailstorm[14], atrophias[14], atrophies[14], plethoras[14], heliports[14], ametropia[13], atemporal[13], spermatia[13], malaperts[13], primatals[13], palmister[13], prelatism[13], temporals[13], aeroliths[12], horsetail[12], isotheral[12], materials[11], amitroles[11], rolamites[11], parietals[11], psalteria[11], pastorale[11], pastorali[11], epilators[11], saprolite[11]

8 letter words

hexaplar[20], hexaplas[20], proximal[19], apomixes[19], axoplasm[19], oxhearts[18], thoraxes[18], preaxial[17], toxaemia[17], expiator[17], toxemias[17], exploits[17], matrixes[17], rheophil[16], pharaohs[16], amphorae[15], amphoral[15], samphire[15], seraphim[15], amphoras[15], aphorism[15], morphias[15], hepatoma[15], teraphim[15], metaphor[15], mateship[15], shipmate[15], apothems[15], trampish[15], saxatile[15], oxalates[15], parhelia[13], hemiolas[13], armholes[13], pearlash[13], earlship[13], harelips[13], plashier[13], aphorise[13], polisher[13], repolish[13], apholate[13], atheroma[13], atrophia[13], plethora[13], heliport[13], helotism[13], apathies[13], haplites[13], tapholes[13], hospital[13], helistop[13], hoplites[13], isopleth[13], thermals[13], teraohms[13], isotherm[13], triphase[13], philters[13], philtres[13], parashot[13], phorates[13], aphorist[13], trophies[13], proemial[12], episomal[12], sapremia[12], impalers[12], impearls[12], lempiras[12], mariposa[12], parosmia[12], meropias[12], rampoles[12], implores[12], lipomata[12], malapert[12], primatal[12], temporal[12], palmiest[12], milepost[12], polemist[12], pastrami[12], primates[12], templars[12], tramples[12], atropism[12], pastromi[12], imposter[12], marplots[12], airholes[11], shoalier[11], aerolith[11], hetairas[11], trehalas[11], hoariest[11], loathers[11], ratholes[11], moralise[10], psoralea[10], pelorias[10], polarise[10], material[10], amitrole[10], rolamite[10], parietal[10], epilator[10], petiolar[10], oatmeals[10], loamiest[10], stapelia[10], spoliate[10], amirates[10], alarmist[10], lamister[10], marliest[10], marlites[10], misalter[10], amortise[10], atomiser[10], moralist[10], aspirate[10], parasite[10], septaria[10], palestra[10], partials[10], pilaster[10], plaister[10], plaiters[10], pastoral[10], petrosal[10], polestar[10], poitrels[10]

7 letter words

rhaphae[15], pharaoh[15], omphali[14], amphora[14], morphia[14], hemiola[12], aphelia[12], armhole[12], harelip[12], ephoral[12], impaler[11], impearl[11], lempira[11], palmier[11], emporia[11], meropia[11], rampole[11], implore[11], airhole[10], loamier[9], peloria[9], malaise[9]