Gender sillies usually just mean not exclusively a man or woman. So non-binary is really just another umbrella term that encompasses gender fluidity, the absence of gender, a mixture of genders, or genders that are separate from male or female. Most gender identities under the enby umbrella are some mix of those or other concepts. I think the term lesbian had a slightly more complex meaning historically but I don't feel qualified to talk about that so I'll go with the wlw definition in which case someone non-binary could be part female such as in a male/female mix or just a demigirl could easily be lesbian.