cassia-bark tree vs cassia

cassia-bark tree and cassia both are nouns.

Word	Noun	Adjective	Verb	Adverb
cassia-bark tree	Yes	No	No	No
cassia	Yes	No	No	No

As nouns, cassia-bark tree and cassia are synonyms defined as:

cassia-bark tree and cassia: Chinese tree with aromatic bark; yields a less desirable cinnamon than Ceylon cinnamon

Other synonyms of cassia-bark tree include Cinnamomum cassia.

cassia-bark tree (noun)	cassia (noun)
Chinese tree with aromatic bark; yields a less desirable cinnamon than Ceylon cinnamon	any of various trees or shrubs of the genus Cassia having pinnately compound leaves and usually yellow flowers followed by long seedpods
	Chinese tree with aromatic bark; yields a less desirable cinnamon than Ceylon cinnamon