marumi vs cumquat

marumi and cumquat both are nouns.

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

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

marumi: shrub bearing round-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 marumi include kumquat, kumquat tree.

marumi (noun)	cumquat (noun)
shrub bearing round-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