American feverfew vs suffrutex

American feverfew and suffrutex both are nouns.

Word	Noun	Adjective	Verb	Adverb
American feverfew	Yes	No	No	No
suffrutex	Yes	No	No	No

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

American feverfew: stout perennial herb of the eastern United States with whitish flowers; leaves traditionally used by Catawba Indians to treat burns
suffrutex: low-growing woody shrub or perennial with woody base

Other hypernyms of American feverfew include subshrub.

American feverfew (noun)	suffrutex (noun)
stout perennial herb of the eastern United States with whitish flowers; leaves traditionally used by Catawba Indians to treat burns	low-growing woody shrub or perennial with woody base