Workmate vs. Colleague: What's the Difference?

Workmate and Colleague Definitions
Workmate
Somebody with whom one works; a coworker.
Colleague
A fellow member of a profession, staff, or academic faculty; an associate.
Workmate
A fellow worker
Colleague
A fellow member of a profession, staff, academic faculty or other organization; an associate.
Colleague
To unite or associate with another or with others.
Young Fortinbras,/ Holding a weak supposal of our worth/...Colleagued with the dream of his advantage,/...hath not failed to pester us with message/ Importing the surrender of those lands/Lost by his father. - Hamlet (Act I, Scene 2)
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Colleague
A partner or associate in some civil or ecclesiastical office or employment. It is never used of partners in trade or manufactures.
Colleague
To unite or associate with another or with others.
Colleague
An associate you work with
Colleague
A person who is member of your class or profession;
The surgeon consulted his colleagues
He sent e-mail to his fellow hackers