| 158525 | Nomu | ketue | | | McElhanon and Voorhoeve (1970) | water |
| 17261 | Northeast Kiwai (Arigibi Dialect) | o'obó | | | Wurm (1973) | |
| 31449 | Northeast Kiwai (Gibaio Dialect) | o'bó | | | Wurm (1973) | |
| 2956 | Northeast Kiwai (Gope Dialect) | obo: | | | Wurm (1973) | |
| 972 | Northeast Kiwai (Urama Dialect) | obo | | | Wurm (1973) | |
| 158520 | Nuk | eme | | | McElhanon and Voorhoeve (1970) | water |
| 199833 | Nuk (Tamben Dialect) | ɑmɛ | | | Retsema et al. (2009) | |
| 199945 | Nuk (Tunam Dialect) | ɛme | | | Retsema et al. (2009) | |
| 158491 | Nukna | imi | | | McElhanon and Voorhoeve (1970) | water |
| 158492 | Nukna (Hamelengan Dialect) | umi | | | McElhanon and Voorhoeve (1970) | water |
| 158517 | Numanggang | imi | | | McElhanon and Voorhoeve (1970) | water |
| 200123 | Numanggang (Kawalang Dialect) | mi | | | Retsema et al. (2009) | |
| 200046 | Numanggang (Tumung Dialect) | ime | | | Retsema et al. (2009) | |
| 213754 | Obokuitai | aɾig̚ | | | Clouse (1997) | |
| 197471 | Odiai | ani | | | Conrad and Dye (1975) | |
| 16311 | Odoodee (Hesif Dialect) | hɔ̃wɔ̃ | | | Shaw (1986) | |
| 16211 | Odoodee (Kalamo Dialect) | hɔ̃wɔ̃ | | | Shaw (1986) | |
| 180338 | Ogea | yʌge | | | Z'graggen (1980) | water |
| 75391 | Oirata | 'ira | | | Taber (1993) | |
| 243906 | Olo | tepe | | | Laycock (1968) | |
| 3681 | Omati | fae | | | Franklin (1973) | |
| 14285 | Ömie | jo|v-e | water | | Dutton (2010) | |
| 16111 | Onabasulu | hanɔ | | | Shaw (1986) | |
| 6006 | Onabasulu | hano | | | Shaw (1973) | |
| 243903 | One, Inebu | fa:la | | | Laycock (1968) | |
| 20581 | Onin | were | | | Voorhoeve (1975) | |
| 91216 | Ono | doku | water | | McElhanon (1967) | water |
| 158523 | Ono (Kip Dialect) | doku | | | McElhanon and Voorhoeve (1970) | water |
| 4574 | Opao | ma | | | Brown (1973) | |
| 24050 | Ormu | ranu | | | Voorhoeve (1975) | |
| 55713 | Orokaiva (Dobuduru Dialect) | umu | water | | Smallhorn (2011) | |
| 28150 | Orokaiva (Dobuduru Dialect) | umo | | | Wilson (1969) | |
| 158555 | Orokaiva (Dobuduru Dialect) | umo | | | McElhanon and Voorhoeve (1970) | water |
| 55714 | Orokaiva (Dobuduru Dialect) | umo | water | | Smallhorn (2011) | |
| 28198 | Orokaiva (Jegarata-Kakendetta Dialect) | umõ | | | Wilson (1969) | |
| 55715 | Orokaiva (Jegarata-Kakendetta Dialect) | umõ | water | | Smallhorn (2011) | |
| 158557 | Orokaiva (Jegarata-Kakendetta Dialect) | umõ | | | McElhanon and Voorhoeve (1970) | water |
| 55716 | Orokaiva (Jegasa-Sarau Dialect) | umu | water | | Smallhorn (2011) | |
| 55717 | Orokaiva (Kendata Dialect) | umõ | water | | Smallhorn (2011) | |
| 28233 | Orokaiva (Kendata Dialect) | umõ | | | Wilson (1969) | |
| 158556 | Orokaiva (Kendata Dialect) | umõ | | | McElhanon and Voorhoeve (1970) | water |
| 55723 | Orokaiva (Sairope Dialect) | umo | water | | Smallhorn (2011) | |
| 158554 | Orokaiva (Sairope Dialect) | umo | | | McElhanon and Voorhoeve (1970) | water |
| 28373 | Orokaiva (Sairope Dialect) | umo | | | Wilson (1969) | |
| 55718 | Orokaiva (Sose Dialect) | umo | water, river | | Smallhorn (2011) | |
| 3994 | Orokolo (Kaipi Dialect) | ma | | | Brown (1973) | |
| 4678 | Orokolo | ma | | | Brown (1973) | |
| 213760 | Orya | ho | | | Clouse (1997) | |
| 25808 | Orya | ho | | | Voorhoeve (1975) | |
| 246273 | Owiniga | bi | | | SIL (1963) | |
