calamondin vs citrous fruit

calamondin and citrous fruit both are nouns.

Word	Noun	Adjective	Verb	Adverb
calamondin	Yes	No	No	No
citrous fruit	Yes	No	No	No

As nouns, citrous fruit is a hypernym of calamondin; that is, citrous fruit is a word with a broader meaning than calamondin:

calamondin: a fruit of the calamondin tree.
citrous fruit: any of numerous fruits of the genus Citrus having thick rind and juicy pulp; grown in warm regions

Other hypernyms of calamondin include citrus, citrus fruit.

calamondin (noun)	citrous fruit (noun)
a fruit of the calamondin tree.	any of numerous fruits of the genus Citrus having thick rind and juicy pulp; grown in warm regions