blue curls vs suffrutex

blue curls and suffrutex both are nouns.

Word	Noun	Adjective	Verb	Adverb
blue curls	Yes	No	No	No
suffrutex	Yes	No	No	No

As nouns, suffrutex is a hypernym of blue curls; that is, suffrutex is a word with a broader meaning than blue curls:

blue curls: any of several plants of the genus Trichostema having whorls of small blue flowers
suffrutex: low-growing woody shrub or perennial with woody base

Other hypernyms of blue curls include subshrub.

blue curls (noun)	suffrutex (noun)
any of several plants of the genus Trichostema having whorls of small blue flowers	low-growing woody shrub or perennial with woody base