How to characterize a tight-knit, high--functioning workplace is an open question. Some consider it a family, due to close working relationships and long hours spent together. Personally, I prefer to focus on the parallels between a group of coworkers and a professional sports team.
Being a good Texan, football is my go-to for sports analogies. A football team, while cohesive, is really made up of several smaller teams. Not everyone is on the field at once, nor are the positions interchangeable. They share a goal—to win—but each smaller team has a different focus and specific tasks to achieve the goal. At a nuclear power plant, there are several departments, each also with a distinct focus but overall contributing together to the goal of reliable, safe, carbon-free energy.