Plantago lanceolata vs buckthorn

Plantago lanceolata and buckthorn both are nouns.

Word	Noun	Adjective	Verb	Adverb
Plantago lanceolata	Yes	No	No	No
buckthorn	Yes	No	No	No

As nouns, Plantago lanceolata and buckthorn are synonyms defined as:

Plantago lanceolata and buckthorn: an Old World plantain with long narrow ribbed leaves widely established in temperate regions

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

Plantago lanceolata (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