tress vs coif

tress and coif both are nouns.

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

As nouns, coif is a hypernym of tress; that is, coif is a word with a broader meaning than tress:

Other hypernyms of tress include coiffure, hair style, hairdo, hairstyle.

tress (noun)	coif (noun)
a hairdo formed by braiding or twisting the 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)

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