Pistachio rhymes with:
mustachio, mustachio, mustachio, mustachio, braggadocio, mustachio, ratio, adagio, audio, borneo, braggadocio, cameo, claudio, dario, embryo, impresario, montevideo, mustachio, oleo, patio, polio, portfolio, presario, presidio, radio, ratio, rodeo, romeo, scorpio, stereo, studio, tokyo
Pistachio sounds like:
packets, packwood's, pact's, pacts, pagoda's, pagodas, pas-de-deux, pastas, pastes, pastiche, pastiches, pasts, pectic, pesetas, pestka, pests, phagocytes, physicists, piaget's, pickets, pickett's, picts, pistachios, pockets, posits, post's, post-attack, postage, postdates, posts, psychotic, pussycats