Formal:
* Colleagues: This is the most formal and widely used synonym.
* Staff: Refers to all employees of a company or organization.
* Teammates: Emphasizes the collaborative nature of the work.
* Associates: A slightly less formal synonym for colleagues.
Informal:
* Workmates: A casual and friendly synonym for coworkers.
* Shopmates: More informal and specific to people who work in a shop or factory.
* Office buddies: Implies a close and friendly relationship.
* Work friends: Similar to "office buddies" but emphasizes the social aspect.
Other Options:
* Peers: Refers to people who are at the same level in the organization.
* Workforce: Refers to all employees of a company or organization.
* Personnel: A formal term for the people who work for an organization.
The best word to use will depend on the specific context and the tone you want to convey.