Holcus lanatus vs velvet grass

Holcus lanatus and velvet grass both are nouns.

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

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

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

Other synonyms of Holcus lanatus include Yorkshire fog.

Holcus lanatus (noun)	velvet grass (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