WordNet (r) 3.0 (2006):

turnaround
    n 1: time need to prepare a vessel or ship for a return trip
         [syn: turnaround, turnaround time]
    2: a decision to reverse an earlier decision [syn: reversal,
       change of mind, flip-flop, turnabout, turnaround]
    3: an area sufficiently large for a vehicle to turn around
    4: act or process of unloading and loading and servicing a
       vessel or aircraft for a return trip [syn: turnaround,
       turnround]
    5: turning in the opposite direction [syn: reversion,
       reverse, reversal, turnabout, turnaround]

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "turnaround":
   about-face, about-turn, afterthoughts, back track, back trail,
   backing, backing off, backing out, backing up, backup,
   better thoughts, change of mind, flip, flip-flop, mature judgment,
   reversal, reverse, reversing, reversion, right-about,
   right-about-face, second thoughts, swingaround, tergiversating,
   tergiversation, turnabout, volte-face