A crossword puzzle clue seeking a word related to the concept of verification, validation, or evidence can be categorized as a request for a term signifying substantiation. For example, a clue might be “Confirmation of a theorem” with the answer being “PROOF.” The structure of such clues often involves synonyms, antonyms, or related concepts to the target word.
Such clues contribute to the overall complexity and intellectual engagement of crossword puzzles. They encourage solvers to consider multiple meanings and associations of words, enhancing vocabulary and critical thinking skills. Historically, crossword puzzles have utilized these types of clues to challenge solvers and provide a satisfying sense of accomplishment upon completion.