kibitzer

a person who meddles in the affairs of others a nosy kibitzer who always knows who is dating whom Synonyms buttinsky (also buttinski), interferer, interloper, intermeddler, intruder, busybody (also kibbitzer), meddler, nosey parker [chiefly British]Related Words gaper, gawker, gawper [chiefly British], gazer, peeper, peeping Tom, prier (also pryer), rubberneck, rubbernecker, snoop, snooper, spy; blabber, discloser, gossip, gossiper, prattler, quidnunc, revealer, teller; betrayer, talebearer, tattler, tattletale, telltale; snake, sneak; informant, informer, snitcher, squealer, stool pigeon