horse cassia vs Cassia grandis

horse cassia and Cassia grandis both are nouns.

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

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

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

Other synonyms of horse cassia include pink shower, pink shower tree.

horse cassia (noun)	Cassia grandis (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