[1] : WordNet (r) 2.0

tour de force
     n : a masterly or brilliant feat

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

49 moby thesaurus words for "tour de force":
   accomplished fact, accomplishment, achievement, act, acta, action,
   adventure, blow, classic, coup, dealings, deed, doing, doings,
   effort, endeavor, enterprise, exploit, fait accompli, feat, gest,
   go, hand, handiwork, job, magnum, maneuver, master stroke,
   masterpiece, masterwork, measure, move, operation, overt act,
   passage, performance, proceeding, production, res gestae, step,
   stroke, stunt, thing, thing done, transaction, turn, undertaking,
   work, works

Force >> F Words
Force, definition of term: Force
force_pag1.html

Force Field >> F Words
Force Field, definition of term: Force Field
force+field_pag1.html

Force Majeure >> F Words
Force Majeure, definition of term: Force Majeure
force+majeure_pag1.html

Driving Force >> D Words
Driving Force, definition of term: Driving Force
driving+force_pag1.html

Coriolis Force >> C Words
Coriolis Force, definition of term: Coriolis Force
coriolis+force_pag1.html

Brute Force >> B Words
Brute Force, definition of term: Brute Force
brute+force_pag1.html