pink shower vs horse cassia

pink shower and horse cassia both are nouns.

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

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

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

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

pink shower (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