mandarin vs citrus

mandarin and citrus both are nouns.

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

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

mandarin: a somewhat flat reddish-orange loose skinned citrus of China
citrus: any of numerous fruits of the genus Citrus having thick rind and juicy pulp; grown in warm regions

Other hypernyms of mandarin include citrous fruit, citrus fruit.

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

mandarin: shrub or small tree having flattened globose fruit with very sweet aromatic pulp and thin yellow-orange to flame-orange rind that is loose and easily removed; native to southeastern Asia
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 mandarin include citrus tree.

mandarin (noun)	citrus (noun)
a somewhat flat reddish-orange loose skinned citrus of China	any of numerous fruits of the genus Citrus having thick rind and juicy pulp; grown in warm regions
a high public official of imperial China	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
any high government official or bureaucrat
a member of an elite intellectual or cultural group
shrub or small tree having flattened globose fruit with very sweet aromatic pulp and thin yellow-orange to flame-orange rind that is loose and easily removed; native to southeastern Asia