cat's foot vs Antennaria

cat's foot and Antennaria both are nouns.

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

cat's foot (noun)	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