Feminenby is a term for any sort of non-binary/woman gender identity. It includes things such as demigirl, xirl, girlby, genderfae, non-binary/girl bigender, and anything else.[1] It's an overarching term for anyone in those groups, especially if one swaps between them often, use multiple labels, or is unsure of the specifics of their identity but know they're some form of non-binary and girl.
Feminenby people may or may not have other genders that are not non-binary or woman.