Active fancy is a term that refers to the imaginative and creative abilities of a person. There are several synonyms that can be used to describe this. Firstly, the term "vivid imagination" can be used to describe someone with an active fancy. Secondly, someone with a creative mind can be said to have an active fancy. Thirdly, the term "lively imagination" can be used interchangeably with active fancy. Fourthly, someone who is inventive or innovative can also be said to have an active fancy. Fifthly, the term "rich imagination" can be used to describe someone with a highly active and creative mind. These synonyms can be used to describe the imaginative abilities of individuals in various contexts.