competition (n.)

• antagonism
• antipathy
• championship
• collision
• competitor
• conflict
• contention
• contest
• contrariety
• contrariness
• dissension
• emulation
• enmity
• event
• fractiousness
• friction
• game
• gamesmanship
• hostility
• match
• meet
• meeting
• negativeness
• obstinacy
• one-upmanship
• perverseness
• recalcitrance
• refractoriness
• repugnance
• rivalry
• strife
• striving
• struggle
• tournament
• tug-of-war
• warfare