Phleum pratense vs herd's grass

Phleum pratense and herd's grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
Phleum pratense	Yes	No	No	No
herd's grass	Yes	No	No	No

As nouns, Phleum pratense and herd's grass are synonyms defined as:

Phleum pratense and herd's grass: grass with long cylindrical spikes grown in northern United States and Europe for hay

Other synonyms of Phleum pratense include timothy.

Phleum pratense (noun)	herd's grass (noun)
grass with long cylindrical spikes grown in northern United States and Europe for hay	grass with long cylindrical spikes grown in northern United States and Europe for hay