Multiagency is a term used to describe collaboration between multiple entities or organizations to achieve a common goal. However, there are several synonyms that can be used to convey the same idea. The word "interagency" can be used to describe cooperation between different agencies or branches of a government. "Cross-functional" can describe cooperation between different departments or teams within the same organization. "Collaborative" and "cooperative" can be used to describe any type of teamwork between multiple parties. "Coordination" and "integration" are other words that can be used to describe the efforts of multiple groups working together towards a common objective. Ultimately, the use of any of these alternative words can help convey the idea of collaborative effort without the repetition of the term "multiagency".