laurel vs cassia

laurel and cassia both are nouns.

Word	Noun	Adjective	Verb	Adverb
laurel	Yes	No	No	No
cassia	Yes	No	No	No

As nouns, cassia is a hyponym of laurel; that is, cassia is a word with a more specific, narrower meaning than laurel:

laurel: any of various aromatic trees of the laurel family
cassia: Chinese tree with aromatic bark; yields a less desirable cinnamon than Ceylon cinnamon

laurel (noun)	cassia (noun)
(antiquity) a wreath of laurel foliage worn on the head as an emblem of victory	any of various trees or shrubs of the genus Cassia having pinnately compound leaves and usually yellow flowers followed by long seedpods
any of various aromatic trees of the laurel family	Chinese tree with aromatic bark; yields a less desirable cinnamon than Ceylon cinnamon