Here are some other terms related to groups of microorganisms:

* Colony: A visible cluster of microorganisms growing on a solid medium.

* Community: A collection of different species of microorganisms living together in a particular environment.

* Biofilm: A complex, organized community of microorganisms encased in a matrix of extracellular polymeric substances (EPS).

* Consortium: A group of microorganisms that work together to perform a specific function.

The best term to use depends on the specific context and what you want to emphasize.