party

[1]	(social) gathering , political party , (cocktail/dinner) party , celebration , fte/fete , function , reception , soir , e , levee , festivity , festivities , festival , frolic , spree , romp , carousal/carouse , saturnalia , bacchanalia , debauch , orgy , (Colloq) get-together , bash , bust , shindig/shindy , ball , at-home , do , (Brit) beanfeast , beano , knees-up , (US) blow-out , (Slang) (Brit) rave/rave-up , (Mainly US/Canadian) wingding , bust-up , (US) hop
[2]	group , company , band , body , corps , gang , crew , team , squad , troop , platoon , detachment , detail , cadre , unit , (Colloq) bunch , outfit
[3]	side , company , interest , faction , league , club , coalition , bloc , division , sect , denomination , clique , coterie , set , cabal , junta/junto , partisans , adherents , confederacy , confederation , federation , (Mainly US/Canadian) caucus
[4]	participant , participator , confederate , associate , ally , accomplice , accessory , approver , ratifier , upholder , contributor , supporter , advocate , backer , aid , helper , seconder , promoter , partisan , defender , exponent , proponent , champion
[5]	individual , person , litigant , plaintiff , defendant , side , interest , signer , signatory , co-signatory , participant , (US) co-signer