cat's-claw vs genus Pithecellobium

cat's-claw and genus Pithecellobium both are nouns.

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

cat's-claw (noun)	genus Pithecellobium (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	thorny shrubs and trees of tropical and subtropical America and Asia