What this means for learners
Taz Selkup and Ket share 16 sounds — roughly 39% of Ket's inventory overlaps with Taz Selkup. Shared sounds are ones a speaker already knows from their native language and will generally produce and perceive accurately without explicit training.
The 16 sounds found only in Ket represent the greatest pronunciation challenge for Taz Selkup speakers. The adult brain tends to map unfamiliar sounds onto the closest native equivalent — a process that produces the characteristic "accent" of a second-language speaker. Learning to hear and produce these sounds as distinct requires focused ear training, not just repetition.
Conversely, Taz Selkup has 25 sounds not used in Ket. Native Ket speakers learning Taz Selkup will face the mirror-image challenge with these sounds.
Phoneme inventories from PHOIBLE. Data reflects one documented inventory per language; some variation exists across dialects and sources.