Transact rhymes with:
exact, inexact, abstract, act, attacked, attract, backed, blacked, bracht, counterattacked, cracked, detract, diffract, distract, enact, exact, extract, fact, hacked, impact, inexact, intact, interact, jacked, kracht, lacked, medfact, overreact, packed, pact, pracht, protract, racked, react, redact, reenact, repacked, retract, sacked, schacht, slacked, smacked, snacked, stacked, subtract, tacked, tact, tracht, tracked, tract, unpacked, whacked, wracked
Transact sounds like:
tarnished, thermostat, thorniest, thronged, tornquist, tourniquet, tournquist, transacted, transect, transected, transit, transited, treurnicht, trinket, trounced, truncate, truncated, turncoat, turnquest, turnquist