The word lesbian isn’t going to solve the ambiguity problem either way, because there are thousands of genders that don’t have a special word for gayness. I’m biromantic, but homosexual. I’m romantically attracted to a broad range of genders similar to My own, but I’m only sexually attracted to genders that are very very similar, and that doesn’t include women. Making “gay” a term only for men would erase people like Me, and thousands of other nonbinary genders.