[1] : The Collaborative International Dictionary of English v.0.48

worker \work"er\, n.
   1. one who, or that which, works; a laborer; a performer; as,
      a worker in brass.
      1913 webster

            professors of holiness, but workers of iniquity.
                                                  --shak.
      1913 webster

   2. zool. one of the neuter, or sterile, individuals of the
      social ants, bees, and white ants. the workers are
      generally females having the sexual organs imperfectly
      developed. see ant, and white ant, under white.
      1913 webster
see also:
ant white ant white 

[2] : WordNet (r) 2.0

worker
     n 1: a person who works at a specific occupation; "he is a good
          worker" ant: nonworker
     2: a member of the working class not necessarily employed;
        "workers of the world--unite" syn: proletarian, prole
     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" syn: actor, doer
see also:
nonworker proletarian prole actor doer 

[3] : Moby Thesaurus II by Grady Ward, 1.0

112 moby thesaurus words for "worker":
   actor, agent, ant, architect, army ant, artisan, assistant, author,
   bee, black ant, blue-collar worker, brainworker, brassworker,
   breadwinner, bumblebee, carpenter ant, casual, casual laborer,
   clothworker, common laborer, craftsman, creator, day laborer, doer,
   drone, emmet, employee, executant, executor, executrix, fabricator,
   factory worker, fieldworker, fire ant, flintworker, flunky,
   free lance, free-lancer, full-time worker, garmentworker,
   girl friday, glassworker, goldworker, hand, handicraftsman,
   hired hand, hired man, hireling, honeybee, hornet, house ant,
   industrial worker, ironworker, jobber, jobholder, laborer,
   laboring man, laceworker, leatherworker, maker, man friday,
   mechanic, medium, menial, mercenary, metalworker, migrant,
   millworker, mineworker, moiler, mover, myrmidon, navvy,
   needleworker, office temporary, operant, operative, operator,
   pensioner, performer, perpetrator, pismire, practitioner,
   prime mover, producer, proletarian, queen, queen bee, red ant,
   right-hand man, roustabout, salaried worker, self-employed person,
   servant, slave ant, soldier, stiff, subject, temporary, termite,
   toiler, wage earner, wage slave, wageworker, wasp, workgirl,
   workhand, working girl, workingman, workingwoman, workman,
   yellow jacket

Worker >> W Words
Worker, definition of term: Worker
worker_pag1.html

Worker Bee >> W Words
Worker Bee, definition of term: Worker Bee
worker+bee_pag1.html

Welfare Worker >> W Words
Welfare Worker, definition of term: Welfare Worker
welfare+worker_pag1.html

Social Worker >> S Words
Social Worker, definition of term: Social Worker
social+worker_pag1.html

Skilled Worker >> S Words
Skilled Worker, definition of term: Skilled Worker
skilled+worker_pag1.html

Farm Worker >> F Words
Farm Worker, definition of term: Farm Worker
farm+worker_pag1.html

Hard Worker >> H Words
Hard Worker, definition of term: Hard Worker
hard+worker_pag1.html

Dock Worker >> D Words
Dock Worker, definition of term: Dock Worker
dock+worker_pag1.html