Same word as nag:

annoy, badger, bait, berate, bug, carp at, dog, eat, egg, find fault, fuss, give a hard time, goad, harry, heckle, hector, hound, importune, irk, irritate, needle, nudge, pester, pick at, plague, prod, provoke, ride, scold, take it out on, tease, torment, upbraid, urge, vex, work on, worry