nagami vs kumquat

nagami and kumquat both are nouns.

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

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

nagami: shrub bearing oval-fruited kumquats
kumquat: 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 tree.

nagami (noun)	kumquat (noun)
shrub bearing oval-fruited kumquats	small oval citrus fruit with thin sweet rind and very acid 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