hair style vs roach

hair style and roach both are nouns.

Word	Noun	Adjective	Verb	Adverb
hair style	Yes	No	No	No
roach	Yes	No	Yes	No

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

hair style (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

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