Gridlock rhymes with:
deadlock, landlock, madlock, padlock, shedlock, wedlock, woodlock, ashlock, blacklock, carlock, deadlock, erlach, flintlock, hammerlock, havelock, hemlock, kalok, landlock, madlock, matchlock, matlock, niblock, oarlock, overlock, padlock, portlock, roadblock, sealock, shedlock, sherlock, shylock, spurlock, subhlok, tatlock, warloeck, wedlock, wheelock, whitelock, whitlock, woodlock
Gridlock sounds like:
gridley's, gridlock's, gridlocks