What this means for learners
KURDISH and Kalmyk share 22 sounds — roughly 47% of Kalmyk's inventory overlaps with KURDISH. Shared sounds are ones a speaker already knows from their native language and will generally produce and perceive accurately without explicit training.
The 17 sounds found only in Kalmyk represent the greatest pronunciation challenge for KURDISH 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, KURDISH has 25 sounds not used in Kalmyk. Native Kalmyk speakers learning KURDISH 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.