Rattlepate, a term used to describe someone who is scatterbrained or flighty, has several synonyms that convey a similar meaning. Some of these synonyms include scatterbrain, featherbrain, flibbertigibbet, airhead, ditz, or ditzy. These terms emphasize the idea of a lack of focus or attention to detail. Other synonyms for rattlepate include space cadet, head-in-the-clouds, and scatterbrained person. These words suggest that the individual is easily distracted or prone to daydreaming, making it difficult to concentrate on tasks at hand. Overall, while different words exist to describe a rattlepate, they all convey the same underlying message of a lack of focus and attention.