orangutan vs orangutang

orangutan and orangutang both are nouns.

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

As nouns, orangutan and orangutang are synonyms defined as:

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

Other synonyms of orangutan include orang, Pongo pygmaeus.

orangutan (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