What word best describes an excessive or overabundant amount?

The term "plethora" is often used to describe an excessive or overabundant amount of something in a more expressive and vivid way. It conveys not just the idea of having more than enough, but also suggests a sense of variety or richness in the quantity present. This word implies an overwhelming presence, which fits the context of describing an abundance that goes beyond mere excess.

While other options, like "surplus" and "excess," also describe situations where there is more than what is needed, they carry a more neutral tone and might not fully capture the expansive or vivid feel associated with "plethora." "Overabundance" is quite similar to "plethora" in meaning, but it can come across as less poetic or elaborate in describing a large quantity. Therefore, "plethora" is the most descriptive choice for conveying the idea of an excessive or overabundant amount.