mountain ebony vs orchid tree

mountain ebony and orchid tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
mountain ebony	Yes	No	No	No
orchid tree	Yes	No	No	No

As nouns, mountain ebony and orchid tree are synonyms defined as:

mountain ebony and orchid tree: small East Indian tree having orchid-like flowers and hard dark wood

Other synonyms of mountain ebony include Bauhinia variegata.

mountain ebony (noun)	orchid tree (noun)
small East Indian tree having orchid-like flowers and hard dark wood	small East Indian tree having orchid-like flowers and hard dark wood