collaborator
n. countable B2 Upper Intermediate US //kəˈɫæbɝˌeɪtɝ// UK //kəlˈæbɔːɹˌeɪtɐ// col·lab·o·ra·tor
n. a person who works with others to achieve a goal or create something. You use this for people who share ideas on a project, like writing a book or starting a business.
n. a person who works jointly on an activity or project. In a historical context, it refers to an individual who cooperates with an enemy nation occupying their country.
She is a frequent collaborator on my research projects.
The director thanked every collaborator who helped bring the complex stage production to life.
Usage
Often followed by the preposition 'on' for projects or 'with' for people.