buckthorn vs Plantago lanceolata

buckthorn and Plantago lanceolata both are nouns.

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

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

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

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

buckthorn (noun)	Plantago lanceolata (noun)
any shrub or small tree of the genus Bumelia	an Old World plantain with long narrow ribbed leaves widely established in temperate regions
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