Synonyms and related words :
bug, bully, bullyrag, carp at, catch at straws, cavil, complain, criticize, cut up, fault-find, find fault, fret at, fuss at, gripe, hassle, henpeck, knock, nag, nibble at, niggle, nitpick, peck at, pester, pettifog, pick at, pick holes, pick on, pick to pieces, pull apart, pull to pieces, quibble, take exception, tear apart, tear to pieces, yap at