Love letters are one of the most heartfelt and romantic gestures one can make to express their affection. These written notes can be full of passion, devotion, and adoration, making them one of the most cherished keepsakes. However, there are many synonyms for love letters that can be used to express similar sentiments. Some of these synonyms include billet-doux, mash notes, valentines, epistles of love, amorous notes, romantic letters, and missives of affection. Whatever the term, love letters hold a special place in our hearts and serve as a reminder of the powerful and enduring emotions of love.