Synonyms for Nag (same or very similar meaning)
WordNet sense 1 (someone (especially a woman) who annoys people by constantly finding fault):
nagger, scold, scolder, common scoldWordNet sense 2 (an old or over-worked horse):
hack, jade, plugWordNet sense 3 (bother persistently with trivial complaints):
peck, hen-peckFrom the ODE community, based on WordNetadd/edit