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From letters S, A, P, R, O, P, E, L  I made following words

8 letter words

prolapse[12], sapropel[12]

7 letter words

lappers[11], rappels[11], slapper[11], apposer[11], poplars[11], loppers[11], propels[11], paroles[9], reposal[9]

6 letter words

lapper[10], rappel[10], poplar[10], lopper[10], propel[10], appels[10], apples[10], appose[10], peplos[10], papers[10], sapper[10], preops[10], parole[8], aslope[8], lapser[8], parles[8], pearls[8], operas[8], pareos[8], soaper[8], parols[8], polars[8], sporal[8], lopers[8], polers[8], proles[8], sloper[8], splore[8]

5 letter words

appel[9], apple[9], pepla[9], paper[9], preop[9], palps[9], pepos[9], popes[9], plops[9], perps[9], preps[9], repps[9], props[9], paler[7], parle[7], pearl[7], opera[7], pareo[7], parol[7], polar[7], loper[7], poler[7], prole[7], lapse[7], leaps[7], pales[7], peals[7], pleas[7], salep[7], sepal[7], spale[7], paseo[7], psoae[7], opals[7], lopes[7], poles[7], slope[7], apers[7], apres[7], asper[7], pares[7], parse[7], pears[7], prase[7], presa[7], rapes[7], reaps[7], spare[7], spear[7], praos[7], proas[7], sapor[7], pores[7], poser[7], prose[7], repos[7], ropes[7], spore[7], aloes[5], arles[5], earls[5], lares[5], laser[5], lears[5], rales[5], reals[5], seral[5], arose[5], orals[5], solar[5], lores[5], loser[5], orles[5], roles[5], sorel[5]

4 letter words

palp[8], pepo[8], pope[8], plop[8], perp[8], prep[8], repp[8], prop[8], apps[8], paps[8], peps[8], pops[8], leap[6], pale[6], peal[6], plea[6], opal[6], lope[6], pole[6], aper[6], pare[6], pear[6], rape[6], reap[6], prao[6], proa[6], pore[6], repo[6], rope[6], apes[6], apse[6], pase[6], peas[6], spae[6], alps[6], laps[6], pals[6], salp[6], slap[6], apos[6], soap[6], epos[6], opes[6], peso[6], pose[6], lops[6], pols[6], slop[6], aloe[4], olea[4], earl[4], lear[4], rale[4], real[4], aero[4], oral[4], lore[4], orle[4], role[4], ales[4], lase[4], leas[4], sale[4], seal[4], also[4], sola[4], lose[4], oles[4], sloe[4], sole[4], ares[4], arse[4], ears[4], eras[4], rase[4], sear[4], sera[4], lars[4], oars[4], osar[4], soar[4], sora[4], eros[4], ores[4], roes[4], rose[4]