buckthorn vs English plantain

buckthorn and English plantain both are nouns.

Word	Noun	Adjective	Verb	Adverb
buckthorn	Yes	No	No	No
English plantain	Yes	No	No	No

As nouns, buckthorn and English plantain are synonyms defined as:

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

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

buckthorn (noun)	English plantain (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