Only in Hindi-Urdu 85
What this means for learners
Hindi-Urdu and Ket share 9 sounds — roughly 10% of Ket's inventory overlaps with Hindi-Urdu. Shared sounds are ones a speaker already knows from their native language and will generally produce and perceive accurately without explicit training.
The 23 sounds found only in Ket represent the greatest pronunciation challenge for Hindi-Urdu 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, Hindi-Urdu has 85 sounds not used in Ket. Native Ket speakers learning Hindi-Urdu 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.