| 125183 | Kein | ginʌbɛt | | | Z'graggen (1980) | small |
| 4336 | Keoru-Ahia (Aheave Dialect) | ehaelakore | | | Brown (1973) | |
| 4126 | Keoru-Ahia | keikaikore | | | Brown (1973) | |
| 6855 | Kerewo | kekebo | | | Wurm (1973) | |
| 181089 | Kesawai | kʌlʌne | | | Z'graggen (1980) | small |
| 181090 | Kesawai | piri taurei | | | Z'graggen (1980) | small |
| 33586 | Ketengban | metek | small, little | | Heeschen (1978) | |
| 33361 | Keuw | núdəә́kémúdnùŋɡúi | | | Kamholz (2012) | |
| 6442 | Kibiri | eteaurimi | | | Wurm (1973) | |
| 218592 | Kirikiri | so | | | Clouse (1997) | |
| 218591 | Kirikiri (Faia Dialect) | kokoβai | | | Clouse (1997) | |
| 77702 | Klon | knit | | | Baird (2008) | |
| 77701 | Klon | knis | | | Baird (2008) | |
| 77695 | Klon | kding | | | Baird (2008) | |
| 77694 | Klon | eleb | | | Baird (2008) | |
| 77520 | Klon | mnaak | | | Baird (2008) | |
| 35192 | Klon (Halerman Dialect) | kikɛn'iit | | | Stokhof (1975) | |
| 35073 | Klon (Probur Dialect) | kɛk'eyn | | | Stokhof (1975) | |
| 144059 | Kobol | ɛpigɛndɛ(ro) | | | Z'graggen (1980) | (small) |
| 196231 | Kobon | pro | - | | Pawley (2013) | |
| 196230 | Kobon | pipi | - | | Pawley (2013) | |
| 196229 | Kobon | apɨc | - | | Pawley (2013) | |
| 163446 | Kobon | ϕro | | | Davies and Comrie (1985) | small |
| 229606 | Kol | kapuʌ | | | SIL (1962) | |
| 230377 | Kol | ka 'pu:o | | | SIL (1981) | |
| 90801 | Komba | mâiktâ | small | | McElhanon (1967) | small |
| 148646 | Komba (Ândâ River Dialect) | mâiktâ | | | Southwell (1976) | small |
| 148645 | Komba (Gwama River (North) Dialect) | mâiktâ | | | Southwell (1976) | small |
| 148648 | Komba (Gwama River (South) Dialect) | mâiktâ | | | Southwell (1976) | small |
| 148647 | Komba (Puleng River Dialect) | mâiktâ | | | Southwell (1976) | small |
| 210879 | Komyandaret | bænˈdʲætɔ | | | Hughes (2009) | |
| 16630 | Konai | fafwi | | | Shaw (1986) | |
| 240446 | Kopar (Singarin Dialect) | ˈmɛndɛkʰ | | | Abbott (1985) | |
| 245353 | Kopar (Singarin Dialect) | 'mɛndɛkʰ | | | SIL (1977) | |
| 28253 | Korafe | koitako | | | Wilson (1969) | |
| 144043 | Korak | (gu)meŋo | | | Z'graggen (1980) | (small) |
| 210676 | Korowai | ʔə'næmdæ: | | | Hughes (2009) | |
| 144053 | Kowaki | yʌte | | | Z'graggen (1980) | (small) |
| 90807 | Kube | komoga | small | | McElhanon (1967) | small |
| 5725 | Kubo | fa̧fi | | | Shaw (1973) | |
| 7197 | Kubo | fãfi | | | Shaw (1986) | |
| 36260 | Kui | kăd'in | | | Stokhof (1975) | |
| 37782 | Kui (Kiramang Dialect) | kĭd'iŋ | | | Stokhof (1975) | |
| 36494 | Kula | m'arnα | | | Stokhof (1975) | |
| 732 | Kuman | kembeřa | | | Trefry (1969) | |
| 32598 | Kuman | kembere | little | | Salisbury (1956) | |
| 28667 | Kuni-Boazi | kapenɑvɑgasi | small (of house) | | Voorhoeve (1970) | |
| 165992 | Kuot | kəppi | adj also 'thin', 'narrow' | | Lindström (2008) | |
| 165989 | Kuot | tətak | (AN? Nochi: dokdok) | x | Lindström (2008) | |
| 163448 | Kyaka | kuki | | | Davies and Comrie (1985) | small |
