cat's-claw vs shrub

cat's-claw and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
cat's-claw	Yes	No	No	No
shrub	Yes	No	No	No

As nouns, shrub is a hypernym of cat's-claw; that is, shrub is a word with a broader meaning than cat's-claw:

cat's-claw: erect shrub with small if any spines having racemes of white to yellow flowers followed by curved pointed pods and black shiny seeds; West Indies and Florida
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of cat's-claw include bush.

cat's-claw (noun)	shrub (noun)
erect shrub with small if any spines having racemes of white to yellow flowers followed by curved pointed pods and black shiny seeds; West Indies and Florida	a low woody perennial plant usually having several major stems