co-worker ˈco-ˌworker noun [countable] JOBS
someone who works with you and has a similar job or position:
• The report criticized them for being bad team players, unable to communicate verbally with their co-workers.
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co-worker UK US (US also coworker) /ˌkəʊˈwɜːkər/ noun [C]
► WORKPLACE a person who you work with, especially someone with a similar job or level of responsibility: »
American workers in recent years have seen their co-workers laid off or downsized out of jobs.
Financial and business terms. 2012.