plait vs coif

plait and coif both are nouns.

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

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

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

plait (noun)	coif (noun)
any of various types of fold formed by doubling fabric back upon itself and then pressing or stitching into shape	a skullcap worn by nuns under a veil or by soldiers under a hood of mail or formerly by British sergeants-at-law
a hairdo formed by braiding or twisting the hair	the arrangement of the hair (especially a woman's hair)

plait (verb)	coif (verb)
weave into plaits	arrange attractively
make by braiding or interlacing	cover with a coif