S: (n) labor, labour, working class, proletariat (a social class comprising those who do manual labor or work for wages) "there is a shortage of skilled labor in this field"
S: (n) worker (sterile member of a colony of social insects that forages for food and cares for the larvae)
S: (n) 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"