king orange vs Citrus nobilis

king orange and Citrus nobilis both are nouns.

Word	Noun	Adjective	Verb	Adverb
king orange	Yes	No	No	No
Citrus nobilis	Yes	No	No	No

As nouns, king orange and Citrus nobilis are synonyms defined as:

king orange and Citrus nobilis: large citrus tree having large sweet deep orange fruit that is easily peeled; widely cultivated in Florida

Other synonyms of king orange include tangor, temple orange, temple orange tree.

king orange (noun)	Citrus nobilis (noun)
large citrus tree having large sweet deep orange fruit that is easily peeled; widely cultivated in Florida	large citrus tree having large sweet deep orange fruit that is easily peeled; widely cultivated in Florida