A "subgenre" refers to a smaller category or group that falls within a larger genre. It helps to further describe or classify something within a broader category. Full definition
Online Dating Sex Sims Dating sims, or relationship simulation role - playing games (RS - RPG), are a video game subgenre of simulation games, usually Japanese, with romantic elements. (singlesdatematch.com)
Leigh Whannell ushered in a new subgenre of horror with Saw, terrified us with the Further in Insidious and ventriloquist dolls in Dead Silence, and even made us laugh with Cooties. (modernhorrors.com)
They are all very popular, but the German Amazon store currently doesn't have many subgenres for this category. (indiesgogerman.com)