coworker
/ˈkoʊˌwɜrkɚ/noun★Intermediate— person you work with
informal
A person who works for the same employer as you, especially in the same department or team.
I asked my coworker to review the report before the deadline.
I requested my colleague to check the report before it was due.
During the project, we collaborated closely with several coworkers from different offices.
We worked closely with many colleagues from various locations during the project.
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Both "coworker" and "co‑worker" are accepted; the hyphenated form is more common in American English.
Collocations
trusted coworkera coworker you rely on for support or advicenew coworkersomeone who has recently started working with youclose coworkera coworker with whom you have a strong professional relationship
English Dictionary