Pongo pygmaeus vs orangutan

Pongo pygmaeus and orangutan both are nouns.

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

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

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

Other synonyms of Pongo pygmaeus include orang, orangutang.

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