'coworker' definitions:

Definition of 'coworker'

From: GCIDE

co-worker \co`-work"er\, coworker \co`work"er\(k?`w?rk"?r), n. One who works with another; a cooperator.
Syn: colleague, coworker, fellow worker, fellow-worker, workfellow. [1913 Webster + WordNet 1.5]