Quack

Noun

 * 1) The sound made by a duck.
 * Did you hear that duck make a quack?

Verb

 * 1) To make a noise like a duck.

Derived terms

 * quack like a duck‎

Noun

 * 1) A fraudulent healer or incompetent doctor of medicine, an impostor who claims to have qualifications to practice medicine.
 * 2) A charlatan.
 * 3)  A doctor.

Verb

 * 1) To practice, commit quackery.

Adjective

 * 1) falsely presented as having medicinal powers.
 * Don't get your hopes up; that's quack medicine!

Verbs for Quack
betray—; detect—; father—; patronize—; warn of—; —bamboozles (colloq.) ; —bilks; —cajoles; —deceives; —dupes; —ensnares; —fakes (colloq.); —gammons; —gulls; — hoaxes; —lures; —outwits; —traps.

Thesaurus
blagueur, bluff, bluffer, cackle, call, carol, caw, charlatan, charlatanic, charlatanish, chatter, cheep, chirk, chirp, chirr, chirrup, chitter, chuck, clack, cluck, cock-a-doodle-doo, coo, counterfeit, counterfeiter, croak, cronk, crow, cuckoo, drum, fake, faker, fourflusher, fraud, fraudulent, gabble, gaggle, gobble, guggle, honk, hoo, hoot, horse doctor, humbug, impersonator, impostor, malingerer, medicaster, medicine man, medicine monger, mountebank, peep, phony, pip, pipe, poser, poseur, pretender, quackish, quacksalver, quackster, ringer, roll, saltimbanco, scold, sham, shammer, simulator, sing, squawk, trill, tweet, twit, twitter, warble, whistle