fescue grass vs Festuca elatior

fescue grass and Festuca elatior both are nouns.

Word	Noun	Adjective	Verb	Adverb
fescue grass	Yes	No	No	No
Festuca elatior	Yes	No	No	No

As nouns, fescue grass and Festuca elatior are synonyms defined as:

fescue grass and Festuca elatior: grass with wide flat leaves cultivated in Europe and America for permanent pasture and hay and for lawns

Other synonyms of fescue grass include fescue, meadow fescue.

fescue grass (noun)	Festuca elatior (noun)
grass with wide flat leaves cultivated in Europe and America for permanent pasture and hay and for lawns	grass with wide flat leaves cultivated in Europe and America for permanent pasture and hay and for lawns