Pongo pygmaeus vs orangutang

Pongo pygmaeus and orangutang both are nouns.

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

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

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

Other synonyms of Pongo pygmaeus include orang, orangutan.

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