Pennae is a Latin word that means "wings" and is often used in the context of birds and airplanes. Some synonyms for Pennae are feathers, pinions, flappers, and wingspan. These words are often used interchangeably, as they all refer to the same anatomical feature. Feathers are the individual plumes that cover the wings, while pinions refer to the primary feathers that create the wing's shape. Flappers is an informal term that means the same thing as wings, while wingspan refers to the distance from one wingtip to the other. Synonyms like these are useful for adding variety to your writing and can help you avoid repetition.