The word 'genuine' is an antonym for 'fictional'. 'Genuine' means being truly what it is said to be, not false or made-up. So, when something is genuine, it's not fictional or pretend.
I'm not entirely sure what 'antonym science fiction' specifically means. It could potentially refer to a genre that is the opposite of traditional science fiction in some way, perhaps a genre that focuses on the present or past without the futuristic and technological elements typical of sci - fi.
An 'antonym love story' could be a story about love that involves opposite elements. For example, it might be a love between two people from very different social classes or with opposing personalities. Maybe it's about a love that starts in a situation of hate or rivalry at first.
Reality-based literature. Since science fiction often involves fictional and speculative elements related to science and technology in the future or in alternate universes, literature based on real events, real people, and current situations can be considered an antonym.
Fantasy. Fantasy often involves elements that are not based on real - world facts or experiences, which is the opposite of realistic fiction that tries to depict real - life situations.
Journal. Journals are often records of real - life events, thoughts, or research findings. In contrast, a novel is a made - up story. So journal can be seen as an antonym as it represents the real and the factual, opposite to the fictional nature of a novel.
The antonym for 'novel' could be 'traditional' or 'conventional'. Something novel is new and unique, while something traditional or conventional is established and familiar.