hairdo vs coif

hairdo and coif both are nouns.

Word	Noun	Adjective	Verb	Adverb
hairdo	Yes	No	No	No
coif	Yes	No	Yes	No

As nouns, hairdo and coif are synonyms defined as:

hairdo and coif: the arrangement of the hair (especially a woman's hair)

Other synonyms of hairdo include coiffure, hair style, hairstyle.

hairdo (noun)	coif (noun)
the arrangement of the hair (especially a woman's hair)	a skullcap worn by nuns under a veil or by soldiers under a hood of mail or formerly by British sergeants-at-law
	the arrangement of the hair (especially a woman's hair)

hairdo (verb)	coif (verb)
	arrange attractively
	cover with a coif