The Pacoh language is a member of the Katuic language group, a part of the Eastern  Mon–Khmer linguistic branch. Most Pacoh speakers live in central Laos and central Vietnam. Pacoh is undergoing substantial change, influenced by the Vietnamese.
Alternative names are Paco, Pokoh, Bo River Van Kieu. Its dialects are Pahi (Ba-Hi). They are officially classified by the Vietnamese government as Ta'Oi (Tà Ôi) people.
Vowels (Sidwell 2003):
Pacoh has six vowel qualities, all of which occur long and short, in modal and creaky voice. Creaky vowels are lowered compared to modally voiced vowels. There are three diphthongs which also occur modal and creaky. Unlike other languages in the area, vowel phonation does not seem to have originated in the phonation of preceding consonants.
|High modal||i iː||ɨ ɨː||u uː|
|Low modal||e eː||ə əː||o oː|
|High creaky||ḛ ḛː||ə̰ ə̰ː||o̰ o̰ː|
|Low creaky||ɛ̰ ɛ̰ː||a̰ a̰ː||ɔ̰ ɔ̰ː|
- Alves, M. J. (2006). A grammar of Pacoh: a Mon–Khmer language of the central highlands of Vietnam. Pacific linguistics, 580. Canberra: Pacific Linguistics, Research School of Pacific and Asian Studies, the Australian National University. ISBN 0-85883-568-1
- Watson, Richard L. (1964). "Pacoh Phonemes". Mon-Khmer Studies Journal.
- Pacoh at Ethnologue (18th ed., 2015)
- Hammarström, Harald; Forkel, Robert; Haspelmath, Martin; Bank, Sebastian, eds. (2016). "Pacoh". Glottolog 2.7. Jena: Max Planck Institute for the Science of Human History.
- Table 41: Austroasiatic languages. Encyclopædia Britannica Online. Retrieved 2007-09-11.
- Mark J. Alves. "A grammar of Pacoh: A Mon–Khmer language of the central highlands of Vietnam". Pacific Linguistics Publishers. Archived from the original on 2007-08-29. Retrieved 2007-09-11.
- Alves, Mark J. 2007. Pacoh Pronouns and Grammaticalization Clines.
- A grammar of Pacoh: A Mon–Khmer language of the central highlands of Vietnam
- The language has these sounds
- Pacoh-English-Vietnamese dictionary by SIL International
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