Hairstyle.
hairdo
Yes, hairdo is one word.
Likely candidate is the word: hairdo.
Yes, and the plural is hairdos.
They spell "hairdo."
One option is the word bouffant.
Those letters spell hairdo.
hairdo
Knot
That is the correct spelling of "hairdo."
knot
the braid of a hairdo is called a "conroe"