orangutang vs orangutan

orangutang and orangutan both are nouns.

Word	Noun	Adjective	Verb	Adverb
orangutang	Yes	No	No	No
orangutan	Yes	No	No	No

As nouns, orangutang and orangutan are synonyms defined as:

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

Other synonyms of orangutang include orang, Pongo pygmaeus.

orangutang (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