[1] : WordNet (r) 2.0

happy hour
     n : the time of day when a bar sells alcoholic drinks at a
         reduced price

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

27 moby thesaurus words for "happy hour":
   break, breath, breather, breathing place, breathing space,
   breathing spell, breathing time, cigarette break, cocktail hour,
   coffee break, downtime, enforced respite, halt, interlude,
   intermission, letup, lull, pause, recess, respite, rest, spell,
   stay, surcease, suspension, tea break, time out

Happy Hour >> H Words
Happy Hour, definition of term: Happy Hour
happy+hour_pag1.html

Hour >> H Words
Hour, definition of term: Hour
hour_pag1.html

Happy >> H Words
Happy, definition of term: Happy
happy_pag1.html

Zero Hour >> Z Words
Zero Hour, definition of term: Zero Hour
zero+hour_pag1.html

Man Hour >> M Words
Man Hour, definition of term: Man Hour
man+hour_pag1.html

Kilowatt Hour >> K Words
Kilowatt Hour, definition of term: Kilowatt Hour
kilowatt+hour_pag1.html

Ampere Hour >> A Words
Ampere Hour, definition of term: Ampere Hour
ampere+hour_pag1.html