Yorkshire fog vs velvet grass

Yorkshire fog and velvet grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
Yorkshire fog	Yes	No	No	No
velvet grass	Yes	No	No	No

As nouns, Yorkshire fog and velvet grass are synonyms defined as:

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

Other synonyms of Yorkshire fog include Holcus lanatus.

Yorkshire fog (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