Noun
1. a person who works at a specific occupation;
"he is a good worker"2. a member of the working class (not necessarily employed);
"workers of the world--unite!"3. sterile member of a colony of social insects that forages for food and cares for the larvae
4. 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"