japonica vs maule's quince

japonica and maule's quince both are nouns.

Word	Noun	Adjective	Verb	Adverb
japonica	Yes	No	No	No
maule's quince	Yes	No	No	No

As nouns, japonica and maule's quince are synonyms defined as:

japonica and maule's quince: deciduous thorny shrub native to Japan having red blossoms

Other synonyms of japonica include Chaenomeles japonica.

japonica (noun)	maule's quince (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