Unzip rhymes with:
zip, zipp, bip, blip, chip, clip, crip, dip, drip, equip, flip, gipp, grip, gripp, gyp, hip, hipp, hippe, ip, kip, kipp, klipp, knipp, lip, lipp, lippe, microchip, nip, nipp, outstrip, pip, pipp, quip, quipp, rip, ripp, rippe, roundtrip, scrip, scripp, ship, shipp, sip, sipp, skip, skipp, slip, snip, stipp, strip, tip, tipp, trip, tripp, trippe, whip, whipp, yip, zip, zipp