noun

a person who helps someone else.

there was no shortage of willing helpers

assistant,co-worker,fellow worker,workmate,teammate,helpmate,helpmeet,associate,aider,aide,colleague,supporter,partner,collaborator,abetter,subordinate,deputy,auxiliary,second,second in command,number two,right-hand man,right-hand woman,wingman,attendant,junior,acolyte,accessory,accomplice,henchman,sidekick