Fantasist is a word that is often used to describe someone who has a vivid imagination or often indulges in unrealistic and improbable ideas. However, there are many other synonyms that describe this type of person, including dreamer, visionary, idealist, romancer, daydreamer, and optimist. A dreamer is someone who is imaginative and has a vision for the future, while a visionary is someone who has a clear and powerful idea of what they want to achieve. An idealist is someone who has high hopes and lofty goals, while a romancer is someone who focuses on the romantic and exciting aspects of life. A daydreamer is someone who spends a lot of time lost in their own thoughts, and an optimist is someone who always sees the best in people and situations.