roach vs coif

roach and coif both are nouns.

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

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

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

roach (noun)	coif (noun)
any of numerous chiefly nocturnal insects; some are domestic pests	a skullcap worn by nuns under a veil or by soldiers under a hood of mail or formerly by British sergeants-at-law
European freshwater food fish having a greenish back	the arrangement of the hair (especially a woman's hair)
the butt of a marijuana cigarette
street names for flunitrazepam
a roll of hair brushed back from the forehead

roach (verb)	coif (verb)
cut the mane off (a horse)	arrange attractively
comb (hair) into a roach	cover with a coif