WordNet (r) 3.0 (2006):

go away
    v 1: move away from a place into another direction; "Go away
         before I start to cry"; "The train departs at noon" [syn:
         go, go away, depart] [ant: come, come up]
    2: go away from a place; "At what time does your train leave?";
       "She didn't leave until midnight"; "The ship leaves at
       midnight" [syn: leave, go forth, go away] [ant:
       arrive, come, get]
    3: become invisible or unnoticeable; "The effect vanished when
       day broke" [syn: vanish, disappear, go away]
    4: get lost, as without warning or explanation; "He disappeared
       without a trace" [syn: disappear, vanish, go away]
       [ant: appear]

Moby Thesaurus II by Grady Ward, 1.0:

96 Moby Thesaurus words for "go away":
   aberrate, be consumed, be getting along, be gone, buzz off, cease,
   cease to be, cease to exist, come away, decline, dematerialize,
   depart, deploy, die, die away, die out, diminish, disappear,
   dispel, disperse, dissipate, dissolve, divaricate, diverge, divide,
   do a fade-out, drift away, dwindle, ebb, erode, evanesce,
   evaporate, exit, fade, fade away, fade out, fan out, flee, fly,
   gang along, get along, get away, get off, get on, get under way,
   go, go along, go off, go on, hide, leave, leave no trace,
   leave the scene, march off, melt, melt away, mosey, move away,
   move off, move out, outspread, pass, pass away, pass out, perish,
   pull away, pull out, recede, retire, retire from sight, retreat,
   retrocede, sashay, sashay off, separate, shrink, sink, sink away,
   splay, spread, stagger along, stand off, suffer an eclipse,
   take flight, take wing, toddle along, up and go, vanish,
   vanish from sight, wane, waste, waste away, wear away,
   widen the distance, wing it, withdraw