sweet orange vs Citrus sinensis

sweet orange and Citrus sinensis both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweet orange	Yes	No	No	No
Citrus sinensis	Yes	No	No	No

As nouns, sweet orange and Citrus sinensis are synonyms defined as:

sweet orange and Citrus sinensis: probably native to southern China; widely cultivated as source of table and juice oranges

Other synonyms of sweet orange include sweet orange tree.

sweet orange (noun)	Citrus sinensis (noun)
orange with sweet juicy pulp; often has a thin skin	probably native to southern China; widely cultivated as source of table and juice oranges
probably native to southern China; widely cultivated as source of table and juice oranges