The word "heapsest" itself may not have many synonyms, but there are various ways to express the same or a similar sentiment. One way is to use the phrase "in abundance" or "abundantly." This can be applied to any noun that is plentiful, such as "resources in abundance." Another option is to use words such as "copious" or "profuse," which indicates a large amount of something. "Excessive," "overabundant," and "overflowing" also depict a significant quantity. Furthermore, "ample" or "plentiful" could apply to a resource or quantity that is satisfactory or more than enough. In summary, there are multiple words and phrases that can capture the idea of "heapsest" in different ways.