quack, n. charlatan, empiric, pretender, mountebank.
quack, a. empirical, charlatanic, quackish.
quackery, n. empiricism, charlatanism, charlatanry, mountebankery.
quackish, a. empirical, charlatanic.
quack medicine. nostrum.
quaggy, a. boggy, queachy, swampy, marshy, fenny.
quagmire, n. slough, swamp, marsh, morass, bog, fen.
quail, n. bobwhite.
quail, v. tremble, cower, flinch, quake, blench, falter.
quaint, a. fanciful, whimsical, odd, curious, grotesque, old-fashioned.