nagami vs cumquat

nagami and cumquat both are nouns.

Word	Noun	Adjective	Verb	Adverb
nagami	Yes	No	No	No
cumquat	Yes	No	No	No

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

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

nagami (noun)	cumquat (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