marsh rosemary vs suffrutex

marsh rosemary and suffrutex both are nouns.

Word	Noun	Adjective	Verb	Adverb
marsh rosemary	Yes	No	No	No
suffrutex	Yes	No	No	No

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

marsh rosemary: any of various plants of the genus Limonium of temperate salt marshes having spikes of white or mauve flowers
suffrutex: low-growing woody shrub or perennial with woody base

Other hypernyms of marsh rosemary include subshrub.

marsh rosemary (noun)	suffrutex (noun)
any of various plants of the genus Limonium of temperate salt marshes having spikes of white or mauve flowers	low-growing woody shrub or perennial with woody base