Cassia marginata vs horse cassia

Cassia marginata and horse cassia both are nouns.

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

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

Cassia marginata and horse cassia: East Indian tree having long pods containing a black cathartic pulp used as a horse medicine

Other synonyms of Cassia marginata include Cassia roxburghii.

Cassia marginata (noun)	horse cassia (noun)
East Indian tree having long pods containing a black cathartic pulp used as a horse medicine	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