cape jessamine vs gardenia

cape jessamine and gardenia both are nouns.

Word	Noun	Adjective	Verb	Adverb
cape jessamine	Yes	No	No	No
gardenia	Yes	No	No	No

As nouns, gardenia is a hypernym of cape jessamine; that is, gardenia is a word with a broader meaning than cape jessamine:

cape jessamine: evergreen shrub widely cultivated for its large fragrant waxlike white flowers and glossy leaves
gardenia: any of various shrubs and small trees of the genus Gardenia having large fragrant white or yellow flowers

cape jessamine (noun)	gardenia (noun)
evergreen shrub widely cultivated for its large fragrant waxlike white flowers and glossy leaves	any of various shrubs and small trees of the genus Gardenia having large fragrant white or yellow flowers