Party

détachement

(military: discrete detachment of troops)

faction

(group of people forming one side in a given dispute, contest etc.)

fête

(social gathering)

groupe

(online gaming: player characters organized into a single group)

groupe

(video games: group of characters controlled by the player)

participant

(someone who takes part)

partie

(law: particular side in a contract or legal action)

party

(social gathering)

teuf

(social gathering)

équipe

(online gaming: player characters organized into a single group)

équipe

(video games: group of characters controlled by the player)

fêter

(to celebrate at a party)

veiller

(to celebrate at a party)