Noun
orang utan (plural orang utans)
Alternative spelling of orangutan
orang-utan (plural orang-utans)
Alternative spelling of orangutan
orang-utan
Other compounds Connecting hyphens are used in a large number of miscellaneous compounds, other than modifiers, such as in lily-of-the-valley, cock-a-hoop, clever-clever, tittle-tattle and orang-utan. Source: Internet
Use is often dictated by convention rather than fixed rules, and hyphenation styles may vary between authors; for example, orang-utan is also written as orangutan or orang utan, and lily-of-the-valley may or may not be hyphenated. Source: Internet