scutch grass vs genus Cynodon

scutch grass and genus Cynodon both are nouns.

Word	Noun	Adjective	Verb	Adverb
scutch grass	Yes	No	No	No
genus Cynodon	Yes	No	No	No

scutch grass (noun)	genus Cynodon (noun)
trailing grass native to Europe now cosmopolitan in warm regions; used for lawns and pastures especially in southern United States and India	creeping perennial grasses of tropical and southern Africa