bay grass vs teff grass

bay grass and teff grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
bay grass	Yes	No	No	No
teff grass	Yes	No	No	No

As nouns, teff grass is a hyponym of bay grass; that is, teff grass is a word with a more specific, narrower meaning than bay grass:

bay grass: any of various grasses of the genus Eragrostis; specially useful for forage and for the prevention of erosion
teff grass: an African grass economically important as a cereal grass (yielding white flour of good quality) as well as for forage and hay

bay grass (noun)	teff grass (noun)
any of various grasses of the genus Eragrostis; specially useful for forage and for the prevention of erosion	an African grass economically important as a cereal grass (yielding white flour of good quality) as well as for forage and hay