kumquat vs kumquat

kumquat and kumquat both are nouns.

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

kumquat (noun)	kumquat (noun)
small oval citrus fruit with thin sweet rind and very acid pulp	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	any of several trees or shrubs of the genus Fortunella bearing small orange-colored edible fruits with thick sweet-flavored skin and sour pulp