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From letters P, U, L, C, H, R, I, T, U, D, I, N, O, U, S  I made following words

15 letter words

pulchritudinous[23]

11 letter words

duplicitous[16], punctilious[15]

10 letter words

trichinous[15], punctilios[14], disruption[13], ridiculous[13]

9 letter words

courtship[16], hidrotics[15], dishclout[15], diplontic[14], dioptrics[14], urolithic[14], chitinous[14], trochilus[14], tricuspid[14], strophuli[14], cothurnus[14], punctilio[13], unpolitic[13], indictors[12], triploids[12], diclinous[12], inductors[12], ludicrous[12], incurious[11], uncurious[11], utriculus[11], dilutions[10], toluidins[10], utilidors[10]

8 letter words

siphonic[15], hoplitic[15], strophic[15], sunporch[15], outpunch[15], touchups[15], dolphins[14], chlorids[14], lordship[14], hidrotic[14], trichoid[14], chlorins[13], trochili[13], ornithic[13], dioptric[13], diprotic[13], tripodic[13], chitlins[13], holistic[13], pisolith[13], historic[13], orchitis[13], trochils[13], cuspidor[13], punditic[13], cothurni[13], cothurns[13], products[13], cipolins[12], picolins[12], psilocin[12], porcinis[12], colpitis[12], politics[12], psilotic[12], hirudins[12], roundish[12], plutonic[12], sinciput[12], puristic[12], culprits[12], sculptor[12], crinoids[11], indictor[11], triploid[11], dictions[11], diplonts[11], sciuroid[11], inductor[11], conduits[11], discount[11], noctuids[11], uroliths[11], unclouds[11], urushiol[11], roundups[11], nitrolic[10], colistin[10], pinitols[10], clitoris[10], coistril[10], crostini[10], tripolis[10], purloins[10], linocuts[10], unspoilt[10], ructions[10], utriculi[10], ructious[10], unctuous[10], tolidins[9], siluroid[9], dilution[9], toluidin[9], utilidor[9], dilutors[9]

7 letter words

chopins[14], phonics[14], ophitic[14], trophic[14], photics[14], splotch[14], dolphin[13], chlorid[13], coldish[13], orchids[13], distich[13], dipshit[13], duncish[13], sulphid[13], holdups[13], upholds[13], diploic[12], chlorin[12], orchils[12], cronish[12], chitlin[12], thiolic[12], thionic[12], poditic[12], trochil[12], litchis[12], chitins[12], coltish[12], chitons[12], shilpit[12], plinths[12], lithops[12], ostrich[12], cushion[12], huipils[12], cipolin[11], picolin[11], porcini[11], inclips[11], dronish[11], dithiol[11], lithoid[11], politic[11], histoid[11], doltish[11], tropics[11], hirudin[11], loudish[11], insculp[11], sculpin[11], unclips[11], oilcups[11], upcoils[11], crinoid[10], codlins[10], lipoids[10], cirsoid[10], noirish[10], spiroid[10], diction[10], diplont[10], indicts[10], hornist[10], disport[10], torpids[10], tripods[10], unipods[10], silicon[9], incisor[9], pinitol[9], noritic[9], tripoli[9], colitis[9], solicit[9], pontils[9], citrins[9], soritic[9], lictors[9], cistron[9], citrons[9], cortins[9], tropins[9], purloin[9], uncoils[9], sordini[8], tolidin[8], dinitro[8], nitrids[8], unsolid[8], sirloin[7], nitrils[7], ironist[7], nostril[7]