Chaenomeles speciosa vs Japanese quince

Chaenomeles speciosa and Japanese quince both are nouns.

Word	Noun	Adjective	Verb	Adverb
Chaenomeles speciosa	Yes	No	No	No
Japanese quince	Yes	No	No	No

As nouns, Chaenomeles speciosa and Japanese quince are synonyms defined as:

Chaenomeles speciosa and Japanese quince: deciduous thorny shrub native to China having red or white blossoms

Chaenomeles speciosa (noun)	Japanese quince (noun)
deciduous thorny shrub native to China having red or white blossoms	deciduous thorny shrub native to China having red or white blossoms