@Grace Warren: In some rare cases, a lump of raw biscuit dough may climb out of the mixing bowl, reject its parentage, put on blue lipstick, date a punk rocker and redefine itself on an emotional cross-continental road trip. In the end, it will realize it was a cookie all along.
As for biscotti, I'm not sure what the popular perspective is on 'biscotti' vs 'biscuit'. My mother talks about biscotti sometimes, but she's actually referring to a brand called Lotus Biscoff, which isn't even Italian. It's Dutch.