game

athletics, sport

battle, conflict, scrimmage, skirmish, struggle, tug-of-war, tussle

championship, national(s)

final, play-off, semifinal

derby, field day, open, outing

biathlon, decathlon, heptathlon, pentathlon, triathlon

marathon, race, ultramarathon

heat, round, run, set

rally, volley

round-robin, rubber, runoff, sudden death

dead heat, photo finish, seesaw

classic

collusion, conspiracy, plot

contrivance, device, gambit, maneuver, ruse, stratagem, subterfuge, trick

counterplan, counterstrategy

means, tactic, technique, way

procedure, protocol

conception, idea, projet, proposal, specific(s), specification(s)

aim, intent, intention, purpose

diagram, formula, layout, map, pattern, platform, policy, recipe, setup

facetiousness, flightiness, flippancy, frivolity, frivolousness, frothiness, levity, light-mindedness, silliness

call, lifework

business, enterprise, field, livelihood, living, métier (also metier), racket [slang]

assignment, engagement, gig, mission

art, craft, handcraft, handicraft

appointment, berth, billet, office, place, position, post, situation

duty, function, job, load, task, workload

frontier

study, subject

territory, turf

occupation, profession, pursuit, racket, vocation

ambit, amplitude, breadth, compass, confine, dimension(s), extent, ken, reach, scope, sweep, width

subfield, subspecialty