roach vs hairdo

roach and hairdo both are nouns.

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

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

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

roach (noun)	hairdo (noun)
any of numerous chiefly nocturnal insects; some are domestic pests	the arrangement of the hair (especially a woman's hair)
European freshwater food fish having a greenish back
the butt of a marijuana cigarette
street names for flunitrazepam
a roll of hair brushed back from the forehead

roach (verb)	hairdo (verb)
cut the mane off (a horse)
comb (hair) into a roach