pomelo vs citrus

pomelo and citrus both are nouns.

Word	Noun	Adjective	Verb	Adverb
pomelo	Yes	No	No	No
citrus	Yes	No	No	No

As nouns, citrus is a hypernym of pomelo; that is, citrus is a word with a broader meaning than pomelo:

pomelo: large pear-shaped fruit similar to grapefruit but with coarse dry pulp
citrus: any of numerous fruits of the genus Citrus having thick rind and juicy pulp; grown in warm regions

Other hypernyms of pomelo include citrous fruit, citrus fruit.

As nouns, citrus is a hypernym of pomelo; that is, citrus is a word with a broader meaning than pomelo:

pomelo: southeastern Asian tree producing large fruits resembling grapefruits
citrus: any of numerous tropical usually thorny evergreen trees of the genus Citrus having leathery evergreen leaves and widely cultivated for their juicy edible fruits having leathery aromatic rinds

Other hypernyms of pomelo include citrus tree.

pomelo (noun)	citrus (noun)
large pear-shaped fruit similar to grapefruit but with coarse dry pulp	any of numerous fruits of the genus Citrus having thick rind and juicy pulp; grown in warm regions
southeastern Asian tree producing large fruits resembling grapefruits	any of numerous tropical usually thorny evergreen trees of the genus Citrus having leathery evergreen leaves and widely cultivated for their juicy edible fruits having leathery aromatic rinds