Chaenomeles japonica vs japonica

Chaenomeles japonica and japonica both are nouns.

Word	Noun	Adjective	Verb	Adverb
Chaenomeles japonica	Yes	No	No	No
japonica	Yes	No	No	No

As nouns, Chaenomeles japonica and japonica are synonyms defined as:

Chaenomeles japonica and japonica: deciduous thorny shrub native to Japan having red blossoms

Other synonyms of Chaenomeles japonica include maule's quince.

Chaenomeles japonica (noun)	japonica (noun)
deciduous thorny shrub native to Japan having red blossoms	deciduous thorny shrub native to Japan having red blossoms
	greenhouse shrub with glossy green leaves and showy fragrant rose-like flowers; cultivated in many varieties