Hudsonia tomentosa vs suffrutex

Hudsonia tomentosa and suffrutex both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hudsonia tomentosa	Yes	No	No	No
suffrutex	Yes	No	No	No

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

Hudsonia tomentosa: small heathlike plant covered with white down growing on beaches in northeastern North America
suffrutex: low-growing woody shrub or perennial with woody base

Other hypernyms of Hudsonia tomentosa include subshrub.

Hudsonia tomentosa (noun)	suffrutex (noun)
small heathlike plant covered with white down growing on beaches in northeastern North America	low-growing woody shrub or perennial with woody base