orangutan vs Pongo pygmaeus

orangutan and Pongo pygmaeus both are nouns.

Word	Noun	Adjective	Verb	Adverb
orangutan	Yes	No	No	No
Pongo pygmaeus	Yes	No	No	No

As nouns, orangutan and Pongo pygmaeus are synonyms defined as:

orangutan and Pongo pygmaeus: large long-armed ape of Borneo and Sumatra having arboreal habits

Other synonyms of orangutan include orang, orangutang.

orangutan (noun)	Pongo pygmaeus (noun)
large long-armed ape of Borneo and Sumatra having arboreal habits	large long-armed ape of Borneo and Sumatra having arboreal habits