worker in WordNet English dictionary

1. a person who acts and gets things done
   "he's a principal actor in this affair"; "when you want something done get a doer"; "he's a miracle worker"
   actor  doer  worker 
   
2. a member of the working class (not necessarily employed)
   "workers of the world--unite!"
   proletarian  prole  worker 
   
3. sterile member of a colony of social insects that forages for food and cares for the larvae
   worker 
   
4. a person who works at a specific occupation
   "he is a good worker"
   worker