ribgrass vs narrow-leaved plantain

ribgrass and narrow-leaved plantain both are nouns.

Word	Noun	Adjective	Verb	Adverb
ribgrass	Yes	No	No	No
narrow-leaved plantain	Yes	No	No	No

As nouns, ribgrass and narrow-leaved plantain are synonyms defined as:

ribgrass and narrow-leaved plantain: an Old World plantain with long narrow ribbed leaves widely established in temperate regions

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

ribgrass (noun)	narrow-leaved plantain (noun)
an Old World plantain with long narrow ribbed leaves widely established in temperate regions	an Old World plantain with long narrow ribbed leaves widely established in temperate regions