Which word refers to something that is both obvious and clear?

The word that refers to something that is both obvious and clear is "patent." In this context, "patent" is derived from its usage meaning something that is readily visible or easily understood, signifying that it is unmistakable or apparent. This aligns perfectly with the definition provided in the question.

The other words do not convey the same meaning. "Penchant" refers to a strong or habitual liking for something, which does not imply clarity or obviousness. "Novel" describes something that is new or original, indicating freshness rather than clarity. Lastly, "mundane" pertains to that which is ordinary or commonplace, lacking the emphasis on clarity or obviousness that "patent" embodies. Therefore, "patent" is the most appropriate term for something that is distinctly clear and evident.