Final answer:
The word 'Love' appears in over 200 novel titles by Barbara Cartland. 'Love' is a prevalent theme in the romance genre and Barbara Cartland's work specifically.
Step-by-step explanation:
The word that appears in the titles of over 200 novels by romantic novelist Barbara Cartland is Love. Barbara Cartland was known for her numerous romantic novels, which often were centered around the themes of love and romance. Indeed, the subject of love is not just prevalent in her work but also common in the literary narrative genre more broadly, serving as a foundation for various story arcs such as the love of a certain skill, pastime, or significant individuals in one's life.