Science fantasy is a genre that combines elements of science fiction and fantasy, often featuring imaginary worlds, advanced technology, and magical powers. There are several synonyms for science fantasy that can be used to describe this genre, such as speculative fiction, crossover fiction, and sci-fantasy. Speculative fiction is a broader term that includes any fiction that speculates about the future or other possible worlds, including science fiction, fantasy, and horror. Crossover fiction is a term used to describe a genre that blends elements from different genres, such as science fiction and fantasy. Sci-fantasy is a more concise term that specifically refers to the blend of science fiction and fantasy elements in a story.