ripple-grass vs buckthorn

ripple-grass and buckthorn both are nouns.

Word	Noun	Adjective	Verb	Adverb
ripple-grass	Yes	No	No	No
buckthorn	Yes	No	No	No

As nouns, ripple-grass and buckthorn are synonyms defined as:

ripple-grass and buckthorn: an Old World plantain with long narrow ribbed leaves widely established in temperate regions

Other synonyms of ripple-grass include English plantain, narrow-leaved plantain, Plantago lanceolata, ribgrass, ribwort.

ripple-grass (noun)	buckthorn (noun)
an Old World plantain with long narrow ribbed leaves widely established in temperate regions	any shrub or small tree of the genus Bumelia
	a shrub or shrubby tree of the genus Rhamnus; fruits are source of yellow dyes or pigments
	an Old World plantain with long narrow ribbed leaves widely established in temperate regions