Cassia grandis vs horse cassia

Cassia grandis and horse cassia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cassia grandis	Yes	No	No	No
horse cassia	Yes	No	No	No

As nouns, Cassia grandis and horse cassia are synonyms defined as:

Cassia grandis and horse cassia: tropical American semi-evergreen tree having erect racemes of pink or rose-colored flowers; used as an ornamental

Other synonyms of Cassia grandis include pink shower, pink shower tree.

Cassia grandis (noun)	horse cassia (noun)
tropical American semi-evergreen tree having erect racemes of pink or rose-colored flowers; used as an ornamental	tropical American semi-evergreen tree having erect racemes of pink or rose-colored flowers; used as an ornamental
	East Indian tree having long pods containing a black cathartic pulp used as a horse medicine