teff vs bay grass

teff and bay grass both are nouns.

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

As nouns, bay grass is a hypernym of teff; that is, bay grass is a word with a broader meaning than teff:

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

Other hypernyms of teff include love grass.

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