cat's-ear vs genus Calochortus

cat's-ear and genus Calochortus both are nouns.

Word	Noun	Adjective	Verb	Adverb
cat's-ear	Yes	No	No	No
genus Calochortus	Yes	No	No	No

cat's-ear (noun)	genus Calochortus (noun)
European weed widely naturalized in North America having yellow flower heads and leaves resembling a cat's ears	large genus of western North American leafy-stemmed bulbous herbs
any of several plants of the genus Calochortus having flowers with petals shaped like cat's ears