Camellia japonica vs camelia

Camellia japonica and camelia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Camellia japonica	Yes	No	No	No
camelia	Yes	No	No	No

As nouns, camelia is a hypernym of Camellia japonica; that is, camelia is a word with a broader meaning than Camellia japonica:

Camellia japonica: greenhouse shrub with glossy green leaves and showy fragrant rose-like flowers; cultivated in many varieties
camelia: any of several shrubs or small evergreen trees having solitary white or pink or reddish flowers

Other hypernyms of Camellia japonica include camellia.

Camellia japonica (noun)	camelia (noun)
greenhouse shrub with glossy green leaves and showy fragrant rose-like flowers; cultivated in many varieties	any of several shrubs or small evergreen trees having solitary white or pink or reddish flowers