Nonbinary women seems like an oxymoron to me, because aren't nonbinary people neither men nor women? I could be very wrong about this. Could you clarify please? Do you mean nonbinary afabs, or are there people who are women and nonbinary?

No I don’t mean nonbinary afab people because not all nonbinary afab people identify as women.

There are people who identify as women and nonbinary. At first when I heard about this I thought it was an oxymoron too, but actually, if you learn more about how nonbinary genders work, it makes sense. And once someone explained it to me, I realized that sometimes I’m a nonbinary guy or nonbinary girl (I’m genderfluid).

How someone explained it me was thusly: don’t think of gender as a spectrum from male to female. But like this post says, like a gender sphere. It’s sort of like the pallet on your Paint program, except in 3D. If someone isn’t a binary woman, that doesn’t make them less feminine necessary or more masculine. It doesn’t make them slide closer to male on the spectrum. Just like if I make my color slightly different than pink, it’s not necessarily more blue or more green- it could be a lot of different things: it might be darker, lighter, grayer, etc etc.

In fact, if someone is nonbinary, they might be a gender gradation that is very close to binary woman, but not quite there, so the designator, role, gender identity and lots of things about it doesn’t feel quite right to them, hence they identify as a nonbinary woman. This also is true for nonbinary men.

For me, even though I’m sometimes a guy or dude, I’ve noticed I don’t like the word “man” to describe me, and I still don’t think a lot of things about myself fit the designator “man.” I feel this way when I am a nonbinary girl too except about the class “woman” and feel really badly about being called a woman—so I wouldn’t call myself a nonbinary woman exactly, but when I am a nonbinary girl I almost feel like a cis girl (I’m afab), but my genitals and body still never quite feel right, but I feel much better about having breasts and other things at that time (not that all nonbinary people experience dysphoria, but I was thinking this might help you understand to talk from my experience). No matter how close the designator woman I feel I’m not quite there, kind of like you might get super close to a particular shade of mauve on that color wheel but never be quite mauve. You might call it “dark mauve” or “purple mauve” or something—it’s still sort of mauve, but not quite…

Edit: So I wouldn’t define nonbinary as: people who are not a men or women, but rather, people who don’t fit the gender binary.

Hopefully that helps explain!