What is a synonym for merging or combining?

The term "amalgamate" is an excellent synonym for merging or combining. It refers specifically to the process of combining two or more entities into a unified whole. This word is often used in various contexts, such as business or science, where different components or organizations come together to form a single entity. The essence of the term captures the idea of integration and cohesion, aligning perfectly with the notion of merging.

In contrast, the other choices present meanings that do not align with the idea of combining. "Gorge" refers to a deep ravine or to eat greedily, which is unrelated to merging concepts. "Exuberant" describes a state of being lively or full of energy, rather than any form of convergence. "Ponderous" indicates something heavy or slow-moving and does not convey any sense of combination or amalgamation. Thus, "amalgamate" stands out as the correct and most relevant answer.