Different word or phrases to describe the way the way women tie up their hair in a bundle on top of their head.
closed as not a real question by simchona♦ Oct 14 '12 at 20:08
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coiffure - a person's hairstyle, typically an elaborate one covers all styles.
bun - a woman's hairstyle where the hair is brought together into a round shape at the back of the head is OP's specific one.
You can speak of a high top bun if you think the difference between back/top of the head is significant.
Or there's the beehive hairstyle, but I'll spare you Amy Winehouse - here's a less extreme one...