crab-eating macaque vs Macaca irus

crab-eating macaque and Macaca irus both are nouns.

Word	Noun	Adjective	Verb	Adverb
crab-eating macaque	Yes	No	No	No
Macaca irus	Yes	No	No	No

As nouns, crab-eating macaque and Macaca irus are synonyms defined as:

crab-eating macaque and Macaca irus: monkey of southeast Asia, Borneo and the Philippines

Other synonyms of crab-eating macaque include croo monkey.

crab-eating macaque (noun)	Macaca irus (noun)
monkey of southeast Asia, Borneo and the Philippines	monkey of southeast Asia, Borneo and the Philippines