Sisyrinchium vs blue-eyed grass

Sisyrinchium and blue-eyed grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sisyrinchium	Yes	No	No	No
blue-eyed grass	Yes	No	No	No

Sisyrinchium (noun)	blue-eyed grass (noun)
chiefly North American grasslike herbs	plant with grasslike foliage and delicate blue flowers