hairstyle vs roach

hairstyle and roach both are nouns.

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

As nouns, roach is a hyponym of hairstyle; that is, roach is a word with a more specific, narrower meaning than hairstyle:

hairstyle (noun)	roach (noun)
the arrangement of the hair (especially a woman's hair)	any of numerous chiefly nocturnal insects; some are domestic pests
	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

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