blue star vs suffrutex

blue star and suffrutex both are nouns.

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

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

blue star: subshrubs of southeastern United States forming slow-growing clumps and having blue flowers in short terminal cymes
suffrutex: low-growing woody shrub or perennial with woody base

Other hypernyms of blue star include subshrub.

blue star (noun)	suffrutex (noun)
subshrubs of southeastern United States forming slow-growing clumps and having blue flowers in short terminal cymes	low-growing woody shrub or perennial with woody base