nagami vs kumquat tree

nagami and kumquat tree both are nouns.

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

As nouns, kumquat tree is a hypernym of nagami; that is, kumquat tree is a word with a broader meaning than nagami:

nagami: shrub bearing oval-fruited kumquats
kumquat tree: 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 hypernyms of nagami include cumquat, kumquat.

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