[1] : WordNet (r) 2.0

smart aleck
     n : an upstart who makes conceited, sardonic, insolent comments
         syn: wise guy, wiseacre, wisenheimer, weisenheimer
see also:
wise guy wiseacre wisenheimer weisenheimer 

[2] : Moby Thesaurus II by Grady Ward, 1.0

41 moby thesaurus words for "smart aleck":
   narcissus, blowhard, boaster, boldface, braggadocio, braggart,
   brazenface, chutzpanik, egocentric, egoist, egotist, exhibitionist,
   gasbag, grandstander, hot-air artist, hussy, individualist,
   know-it-all, malapert, minx, narcissist, narcist, no modest violet,
   pup, puppy, saucebox, show-off, smart-ass, smarty, smarty-pants,
   swaggerer, swellhead, upstart, whippersnapper, windbag, wise guy,
   wise-ass, wiseacre, wisecracker, wisehead, wisenheimer

Smart Aleck >> S Words
Smart Aleck, definition of term: Smart Aleck
smart+aleck_pag1.html

Smart >> S Words
Smart, definition of term: Smart
smart_pag1.html

Smart Set >> S Words
Smart Set, definition of term: Smart Set
smart+set_pag1.html

Smart Card >> S Words
Smart Card, definition of term: Smart Card
smart+card_pag1.html