rhesus monkey vs Macaca mulatta

rhesus monkey and Macaca mulatta both are nouns.

Word	Noun	Adjective	Verb	Adverb
rhesus monkey	Yes	No	No	No
Macaca mulatta	Yes	No	No	No

As nouns, rhesus monkey and Macaca mulatta are synonyms defined as:

rhesus monkey and Macaca mulatta: of southern Asia; used in medical research

Other synonyms of rhesus monkey include rhesus.

rhesus monkey (noun)	Macaca mulatta (noun)
of southern Asia; used in medical research	of southern Asia; used in medical research