velvet grass vs Holcus lanatus

velvet grass and Holcus lanatus both are nouns.

Word	Noun	Adjective	Verb	Adverb
velvet grass	Yes	No	No	No
Holcus lanatus	Yes	No	No	No

As nouns, velvet grass and Holcus lanatus are synonyms defined as:

velvet grass and Holcus lanatus: tall European perennial grass having a velvety stem; naturalized in United States and used for forage

Other synonyms of velvet grass include Yorkshire fog.

velvet grass (noun)	Holcus lanatus (noun)
tall European perennial grass having a velvety stem; naturalized in United States and used for forage	tall European perennial grass having a velvety stem; naturalized in United States and used for forage