Ok, I had to look this up to be quite sure I was giving you the correct answer. Worker = a person who works, especially in a stated job. For example; an office worker, a factory worker, a health-care worker. Labor = a group or collection of workers, especially those who work with their hands. This noun is uncountable. For example: organized labor, labor force, employer-labor relations. employee = a person who works for the specified company/person/organization If you have many questions like this, I recommend that you get a copy of Longman's "Dictionary of Contemporary English." It is the best I've seen for non-native speakers of English.