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