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