Confrere and Co-worker

Confrere noun - A fellow worker.

Co-worker and confrere are semantically related in associate topic. In some cases you can use "Co-worker" instead a noun "Confrere", when it comes to topics like cohort.

Co-worker noun - An associate that one works with.

Confrere and co-worker are semantically related in friend topic. You can use "Confrere" instead a noun phrase "Co-worker", if it concerns topics such as associate, cohort.