kumquat tree vs cumquat

kumquat tree and cumquat both are nouns.

Word	Noun	Adjective	Verb	Adverb
kumquat tree	Yes	No	No	No
cumquat	Yes	No	No	No

As nouns, kumquat tree and cumquat are synonyms defined as:

kumquat tree and cumquat: any of several trees or shrubs of the genus Fortunella bearing small orange-colored edible fruits with thick sweet-flavored skin and sour pulp

Other synonyms of kumquat tree include kumquat.

kumquat tree (noun)	cumquat (noun)
any of several trees or shrubs of the genus Fortunella bearing small orange-colored edible fruits with thick sweet-flavored skin and sour pulp	any of several trees or shrubs of the genus Fortunella bearing small orange-colored edible fruits with thick sweet-flavored skin and sour pulp