Citrus nobilis vs king orange

Citrus nobilis and king orange both are nouns.

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

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

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

Other synonyms of Citrus nobilis include tangor, temple orange, temple orange tree.

Citrus nobilis (noun)	king orange (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