Cydonia oblonga vs quince

Cydonia oblonga and quince both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cydonia oblonga	Yes	No	No	No
quince	Yes	No	No	No

As nouns, Cydonia oblonga and quince are synonyms defined as:

Cydonia oblonga and quince: small Asian tree with pinkish flowers and pear-shaped fruit; widely cultivated

Other synonyms of Cydonia oblonga include quince bush.

Cydonia oblonga (noun)	quince (noun)
small Asian tree with pinkish flowers and pear-shaped fruit; widely cultivated	aromatic acid-tasting pear-shaped fruit used in preserves
	small Asian tree with pinkish flowers and pear-shaped fruit; widely cultivated