Fortunella japonica vs round kumquat

Fortunella japonica and round kumquat both are nouns.

Word	Noun	Adjective	Verb	Adverb
Fortunella japonica	Yes	No	No	No
round kumquat	Yes	No	No	No

As nouns, Fortunella japonica and round kumquat are synonyms defined as:

Fortunella japonica and round kumquat: shrub bearing round-fruited kumquats

Other synonyms of Fortunella japonica include marumi, marumi kumquat.

Fortunella japonica (noun)	round kumquat (noun)
shrub bearing round-fruited kumquats	shrub bearing round-fruited kumquats