There are a number of synonyms for the term "young adult fiction." Some of the most commonly used include "YA fiction," "teen fiction," "adolescent literature," "juvenile fiction," and "young adult literature." These terms all refer to books that are written for readers between the ages of 12 and 18, and typically deal with themes and issues that are relevant to that age group, such as coming of age, first love, and the challenges of growing up in a complex world. Whether you prefer to call it YA fiction, adolescent literature, or something else entirely, it's clear that this genre of books has become increasingly popular in recent years, and continues to captivate readers of all ages.