battle
business
challenge
clash
compete
competition
competitive
competitor
concept
conflict
contender
contest
contestant
employee
enemy
equal
fighting
game
group
human
idea
loser
losing
man
match
matchup
opposition
people
person
power
pulling
rival
rivalry
rope
sport
strength
strong
struggle
struggling
team
teammates
teamwork
tournament
tug of war
versus
vs
winner
winning
worker