Speculative fiction
Speculative fiction, a broad genre that spans fantasy, science fiction, and horror by exploring worlds that cannot exist under the known physical laws or current technologies. It covers themes in the context of supernatural, futuristic, and other imaginative realms, deals with human experience rather than technology, and explores possible futures. The genre also includes hybrids, derivatives, and related subgenres such as gothic, dystopian, weird fiction, post-apocalyptic fiction, ghost stories, superhero tales, alternate history, steampunk, slipstream, magical realism, and fractured fairy tales.
While science fiction speculates on future events with a foundation in scientific principles, fantasy and paranormal stories introduce elements of the supernatural, with paranormal fiction typically set in the real world. Dark fantasy is a type of horror in which humanity is threatened by forces beyond human understanding. The subgenre allows the narratives to shift from the viewpoint of the monster rather than the victim or survivor.
The table below represents the most comprehensive summary I found:
Fantasy
Fiction that cannot or will never occur.
Classical Fantasy
Improbabilities explained by magic-type powers
High Fantasy
Elves, dragons, swords and sorcery
Mythic Fiction
Classic good vs evil; deities and superheroes.
Dark Fantasy
Gothic, horror, ghosts, vampires, werewolves
Science-Fiction
Improbabilities explained by improbable technology
Space Romance
Relationships-driven story with nominal, arguably unessential SF subplots.
Space Opera
Focus on a colorful cast of characters and dramatic or political conflicts rather than scientific plausibility.
Science Fiction
Fiction based on a projection of what may be possible using current knowledge.
Soft Sci-Fi
Otherwise possible world with one or more major departures from accepted science.
Social Sci-Fi
The impacts of major technological advances on humanity
Sci-Fi adventure
Opportunities afforded by technology with more scientific realism than Sci-Fi
Hard Sci-Fi
Fiction based upon projections using solid scientific principles and knowledge.
Applied theory
Fiction that uses known scientific principles to explore possible future advances, which are currently unattainable due to political, technological, or financial limitations.
Call to action
Shows probable future problems arising from likely advances in science.