What is the meaning of worker?

noun

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