Chukotko-Kamchatkan–Amuric languages

The Chukotko-Kamchatko-Amuric or Chukotko-Kamchatkan-Amuric languages form a hypothetical language family including Nivkh and Chukotko-Kamchatkan. A relationship between these two language groups was proposed by Michael Fortescue in a 2011 paper. He theorized that their common ancestor might have been spoken around 4000 years ago. However Glottolog says that the evidence is insufficient to conclude a genealogical relationship between Nivkh and Chukotko-Kamchatkan.

Phonological
Proposed sound correspondences Some cognates which include a sound change of Nivkh /ə/ and CK /æ/ are: t’əkə ‘edge of sleeping platform’ and CK tæγən 'near the edge of and Nivkh ərŋ 'mouth of a river' and CK ær'' 'flow out'.

Lexical
Proposed Nivkh-Chukotko-Kamchatkan cognates

Morphological
Chukotko-Kamchatkan and Nivkh have dual/plural distinction, however it has been lost in Chukchi.

Chukotko-Kamchatkan also has a "singulative" ending, and traces of a singulative ending in Nivkh might be seen.