ripple-grass vs ribgrass

ripple-grass and ribgrass both are nouns.

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

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

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

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

ripple-grass (noun)	ribgrass (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