Which word describes elements that are fundamentally different and cannot be compared?

The term "disparate" is used to describe elements or items that are fundamentally different in kind or quality and are so distinct that they cannot be meaningfully compared. When two things are described as disparate, it implies a significant gap or lack of commonality between them. This word is often used in contexts such as discussions of social issues, economics, or philosophy, where contrasting elements highlight their differences.

In contrast, the other options do not convey the same meaning. "Aberrant" refers to something that deviates from the norm or standard, suggesting a variation but not necessarily an inability to compare. "Nebulous" describes something unclear or vague, lacking the sharpness to distinguish differences in a meaningful way. Lastly, "maverick" denotes someone who is independent-minded or unconventional, but it does not specifically suggest fundamental difference or comparison issues. Thus, "disparate" is the correct choice for indicating a lack of comparable elements.