horse cassia vs pink shower tree

horse cassia and pink shower tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
horse cassia	Yes	No	No	No
pink shower tree	Yes	No	No	No

As nouns, horse cassia and pink shower tree are synonyms defined as:

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

Other synonyms of horse cassia include Cassia grandis, pink shower.

horse cassia (noun)	pink shower tree (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