sticktight vs subshrub

sticktight and subshrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
sticktight	Yes	No	No	No
subshrub	Yes	No	No	No

As nouns, subshrub is a hypernym of sticktight; that is, subshrub is a word with a broader meaning than sticktight:

sticktight: any of several plants of the genus Bidens having yellow flowers and prickly fruits that cling to fur and clothing
subshrub: low-growing woody shrub or perennial with woody base

Other hypernyms of sticktight include suffrutex.

sticktight (noun)	subshrub (noun)
parasitic on especially the heads of chickens	low-growing woody shrub or perennial with woody base
any of several plants of the genus Bidens having yellow flowers and prickly fruits that cling to fur and clothing