The noun worker has 4 senses (first 4 from tagged texts)
1. (289) worker -- (a person who works at a specific occupation; "he is a good worker")
2. (135) proletarian, prole, worker -- (a member of the working class (not necessarily employed); "workers of the world--unite!")
3. (10) worker -- (sterile member of a colony of social insects that forages for food and cares for the larvae)
4. (5) actor, doer, worker -- (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")