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From letters X, E, R, O, P, H, Y, T, I, C  I made following words

10 letter words

xerophytic[27]

9 letter words

hypocrite[19]

7 letter words

hypoxic[24], pyrexic[21], excitor[16], xerotic[16], potiche[14], pitcher[14], trophic[14], pyretic[14]

6 letter words

ethoxy[19], expiry[18], peroxy[18], exhort[16], cypher[16], chirpy[16], pitchy[16], poxier[15], exotic[15], cortex[15], export[15], ochery[14], cherty[14], torchy[14], trophy[14], ceriph[13], cipher[13], orphic[13], photic[13], pricey[13], recopy[13], cotype[13], crypto[13], theory[12], coheir[11], heroic[11], ephori[11], ophite[11], cither[11], thrice[11], hector[11], rochet[11], rotche[11], tocher[11], troche[11], rhotic[11], thoric[11], pother[11], thorpe[11], pyrite[11], typier[11], poetry[11], copier[10], poetic[10], tricep[10], copter[10], tropic[10], heriot[9], erotic[8], protei[8]

5 letter words

pyxie[17], epoxy[17], prexy[17], pyrex[17], proxy[17], xeric[14], toxic[14], ochry[13], hyper[13], techy[13], itchy[13], pithy[13], epoch[12], perch[12], chirp[12], porch[12], pitch[12], oxter[12], crepy[12], pricy[12], pyric[12], typic[12], crypt[12], yirth[11], chore[10], ocher[10], ochre[10], chiro[10], choir[10], ichor[10], ephor[10], hoper[10], ethic[10], tophe[10], tophi[10], chert[10], retch[10], rotch[10], torch[10], thrip[10], thorp[10], coyer[10], ropey[10], piety[10], tepoy[10], cripe[9], price[9], coper[9], optic[9], picot[9], topic[9], crept[9], ither[8], their[8], other[8], throe[8], toyer[8], citer[7], recit[7], recti[7], trice[7], recto[7], toric[7], tripe[7], repot[7], toper[7], trope[7]

4 letter words

expo[13], prex[13], yech[12], hype[12], hypo[12], pech[11], chip[11], chop[11], exit[11], pyic[11], copy[11], echo[9], hope[9], rich[9], echt[9], etch[9], tech[9], chit[9], itch[9], pith[9], phot[9], toph[9], yipe[9], cory[9], prey[9], pyre[9], epic[8], pice[8], cope[8], crop[8], heir[7], hire[7], hero[7], hoer[7], thio[7], thir[7], thro[7], oyer[7], yore[7], cire[6], rice[6], cero[6], core[6], coir[6], peri[6], pier[6], ripe[6], pore[6], repo[6], rope[6], cite[6], etic[6], cote[6], otic[6], poet[6], tope[6], topi[6], crit[6], torc[6], pert[6], trip[6], port[6], trop[6], rite[4], tier[4], tire[4], rote[4], tore[4], riot[4], roti[4], tiro[4], tori[4], trio[4]