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

12 letter words

heliotropism[19]

10 letter words

limitrophe[17], ophiolites[15], metropolis[14]

9 letter words

homeports[16], motorship[16], heirlooms[14], ophiolite[14], heliports[14], portholes[14], prelimits[13], meliorist[11], pistolier[11], pistolero[11]

8 letter words

isomorph[15], homeport[15], mephitis[15], heirloom[13], homilies[13], polisher[13], repolish[13], heliport[13], porthole[13], helotism[13], homilist[13], smoothie[13], lothsome[13], helistop[13], hoplites[13], isopleth[13], pisolith[13], isophote[13], posthole[13], potholes[13], isotherm[13], resmooth[13], smoother[13], philters[13], philtres[13], trophies[13], hoopster[13], liposome[12], imperils[12], limpsier[12], implores[12], impolite[12], prelimit[12], optimise[12], milepost[12], polemist[12], imposter[12], promotes[12], impostor[12], liriopes[10], toilsome[10], pisolite[10], polities[10], loopiest[10], limiters[10], troilism[10], mooriest[10], motorise[10], roomiest[10], tremolos[10], poitrels[10], tripolis[10], roiliest[8], oestriol[8]

7 letter words

phloems[14], orphism[14], rompish[14], morphos[14], heroism[12], moorish[12], hirples[12], rosehip[12], hoopers[12], poorish[12], hoplite[12], pothole[12], mothier[12], pithier[12], philter[12], philtre[12], homiest[12], shilpit[12], ophites[12], lithops[12], hermits[12], mithers[12], mothers[12], smother[12], thermos[12], rimshot[12], hipster[12], pothers[12], strophe[12], thorpes[12], imperil[11], implore[11], implies[11], pomelos[11], pismire[11], primsie[11], limpers[11], prelims[11], rimples[11], simpler[11], imposer[11], promise[11], semipro[11], oosperm[11], premolt[11], promote[11], pietism[11], limpest[11], limpets[11], mopiest[11], optimes[11], imprest[11], permits[11], hootier[10], eoliths[10], holiest[10], hostile[10], ooliths[10], slither[10], heriots[10], hoister[10], shortie[10], holster[10], hostler[10], hooters[10], reshoot[10], sheroot[10], shooter[10], soother[10], liriope[9], loopier[9], milreis[9], slimier[9], moilers[9], roomies[9], spoiler[9], loopers[9], poolers[9], respool[9], spooler[9], limiter[9], miltier[9], motlier[9], tremolo[9], poitrel[9], politer[9], tripoli[9], elitism[9], limiest[9], limites[9], motiles[9], piolets[9], pistole[9], isotope[9], poloist[9], topsoil[9], miriest[9], mistier[9], rimiest[9], milters[9], erotism[9], moister[9], mortise[9], trisome[9], merlots[9], molters[9], mooters[9], pitiers[9], tipsier[9], resplit[9], triples[9], prostie[9], reposit[9], riposte[9], ropiest[9], petrols[9], replots[9], orioles[7], iolites[7], oiliest[7], oolites[7], ostiole[7], stoolie[7], siltier[7], estriol[7], loiters[7], toilers[7], sootier[7], looters[7], retools[7], rootles[7], toolers[7]