Proto-Chukotko-Kamchatkan is the hypothetical common ancestor of the Chukotko-Kamchatkan languages

Chukotko-Kamchatkan languages

The Chukotko-Kamchatkan or Chukchi–Kamchatkan languages are a language family of extreme northeastern Siberia. Its speakers are indigenous hunter-gatherers and reindeer-herders....

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A reconstructed version of the language is presented by Michael Fortescue

Michael Fortescue

Michael David Fortescue is a British-born linguist specializing in Arctic and native North American languages, including Kalaallisut, Inuktun, Chukchi and Nitinaht. He is professor of General Linguistics at the University of Copenhagen and chairman of the Linguistic Circle of Copenhagen...

 in his Comparative Dictionary of Chukotko-Kamchatkan (2005).

Phonology

According to Fortescue, Proto-Chukotko-Kamchatkan had the following phoneme

Phoneme

In a language or dialect, a phoneme is the smallest segmental unit of sound employed to form meaningful contrasts between utterances....

s, expressed in IPA symbols.

Consonants

	labial	alveolar	palatal	velar	uvular
Stops Stop consonant In phonetics, a plosive, also known as an occlusive or an oral stop, is a stop consonant in which the vocal tract is blocked so that all airflow ceases. The occlusion may be done with the tongue , lips , and &...	p	t	c	k	q
Fricatives Fricative consonant Fricatives are consonants produced by forcing air through a narrow channel made by placing two articulators close together. These may be the lower lip against the upper teeth, in the case of ; the back of the tongue against the soft palate, in the case of German , the final consonant of Bach; or...	v	ð		ɣ	ʁ
Nasals Nasal consonant A nasal consonant is a type of consonant produced with a lowered velum in the mouth, allowing air to escape freely through the nose. Examples of nasal consonants in English are and , in words such as nose and mouth.- Definition :...	m	n		ŋ
Approximants Approximant consonant Approximants are speech sounds that involve the articulators approaching each other but not narrowly enough or with enough articulatory precision to create turbulent airflow. Therefore, approximants fall between fricatives, which do produce a turbulent airstream, and vowels, which produce no...	w	l	j
Rhotic Rhotic consonant In phonetics, rhotic consonants, also called tremulants or "R-like" sounds, are liquid consonants that are traditionally represented orthographically by symbols derived from the Greek letter rho, including "R, r" from the Roman alphabet and "Р, p" from the Cyrillic alphabet...		r

*/c/ is a true voiceless palatal stop (not the affricate č). Note that Proto-Chukotko-Kamchatkan had only voiceless stops, no voiced stops (such as /b d g/). However, there is a series of voiced fricatives

Fricative consonant

Fricatives are consonants produced by forcing air through a narrow channel made by placing two articulators close together. These may be the lower lip against the upper teeth, in the case of ; the back of the tongue against the soft palate, in the case of German , the final consonant of Bach; or...

, */v ð ɣ ʁ/. These have no voiceless counterparts (such as /f θ x/).

*/v/ is a voiced labiodental fricative (like v in English). */ɣ/ is a voiced velar fricative (like the g in Dutch ogen, modern Greek gamma, Persian qāf, etc.). */ʁ/ is a voiced uvular fricative (like r in French).

The entire */t ð n l r/ series is alveolar — i.e. */t ð n/ are not dentals.

Vowels

	Front Front vowel A front vowel is a type of vowel sound used in some spoken languages. The defining characteristic of a front vowel is that the tongue is positioned as far in front as possible in the mouth without creating a constriction that would be classified as a consonant. Front vowels are sometimes also...	Central Central vowel A central vowel is a type of vowel sound used in some spoken languages. The defining characteristic of a central vowel is that the tongue is positioned halfway between a front vowel and a back vowel...	Back Back vowel A back vowel is a type of vowel sound used in spoken languages. The defining characteristic of a back vowel is that the tongue is positioned as far back as possible in the mouth without creating a constriction that would be classified as a consonant. Back vowels are sometimes also called dark...
Close Close vowel A close vowel is a type of vowel sound used in many spoken languages. The defining characteristic of a close vowel is that the tongue is positioned as close as possible to the roof of the mouth without creating a constriction that would be classified as a consonant.This term is prescribed by the...	i		u
Mid Mid vowel A mid vowel is a vowel sound used in some spoken languages. The defining characteristic of a mid vowel is that the tongue is positioned mid-way between an open vowel and a close vowel...	e	ə	o
Open Open vowel An open vowel is defined as a vowel sound in which the tongue is positioned as far as possible from the roof of the mouth. Open vowels are sometimes also called low vowels in reference to the low position of the tongue...	æ		a