Translation:They are women.
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If anything the question should be why isn't it "אישות" because the singular is "אישה".
There's an old Aramaic word for man that made it into Hebrew: "נש". Although it is masculine, this is used mostly as a gender-neutral person. And yet נשים is obviously derived from that while still being the plural of אישה.
So the answer to your "why" question is "because languages are weird"