Pectic rhymes with:
apoplectic, dialectic, eclectic, hectic, antarctic, anticlimactic, apoplectic, arctic, chiropractic, climactic, dialectic, didactic, eclectic, extragalactic, galactic, hectic, lactic, prophylactic, tactic
Pectic sounds like:
packets, packwood's, pact's, pacts, pagoda's, pagodas, pas-de-deux, pastas, pastes, pastiche, pastiches, pasts, pesetas, pestka, pests, phagocytes, physicists, piaget's, pickets, pickett's, picts, pistachio, pistachios, pockets, posits, post's, post-attack, postage, postdates, posts, psychotic, pussycats