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 scold
WordNet sense 2 (an old or over-worked horse):
hack, jade, plug
WordNet sense 3 (bother persistently with trivial complaints):
peck, hen-peck
From the ODE community, based on WordNet
add/edit