worker

(noun) a person who works at a specific occupation. Example: "He is a good worker."

(noun) a member of the working class (not necessarily employed). Synonyms: proletarian, prole. Example: "Workers of the world--unite!."

(noun) sterile member of a colony of social insects that forages for food and cares for the larvae.

(noun) a person who acts and gets things done. Synonyms: actor, doer. Examples: "He's a principal actor in this affair." "When you want something done get a doer." "He's a miracle worker."