The crossword solution for the term 'Explanatory Words for Heading' is 'CAPTION', which is a seven-letter word. A CAPTION is a brief description or explanation accompanying an image, illustration, or text. Captions are often used to provide context for the content they accompany, and can be used to explain a concept, provide additional information, or draw attention to a particular element of the content. Captions are commonly used in newspapers, magazines, and other publications, as well as on websites and social media.