cat's foot vs genus Antennaria

cat's foot and genus Antennaria both are nouns.

Word	Noun	Adjective	Verb	Adverb
cat's foot	Yes	No	No	No
genus Antennaria	Yes	No	No	No

cat's foot (noun)	genus Antennaria (noun)
low-growing perennial herb having leaves with whitish down and clusters of small white flowers	small woolly perennial herbs having small whitish discoid flowers surrounded by a ring of club-shaped bristles