Coworker and Co-worker

Coworker noun - A fellow worker.

Co-worker and coworker are semantically related in friend topic. In some cases you can use "Co-worker" instead a noun "Coworker", when it comes to topics like colleague, associate, ally, assistant.

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

Coworker and co-worker are semantically related in friend topic. You can use "Coworker" instead a noun phrase "Co-worker", if it concerns topics such as partner, companion, person who takes part with another, person who helps another.