Lovebirds are a type of small parrot that are known for their strong pair bonds and affectionate behavior. The term 'lovebirds' is often used to refer to couples in a romantic relationship, and this is reflected in the two crossword solutions: SWEETHEARTS (11 letters) and Tweethearts (11 letters). SWEETHEARTS is a term of endearment used to refer to a couple in love, while Tweethearts is a more modern term that refers to couples who express their love for each other on social media.