What this means for learners
ACHUMAWI and Kabardian share 14 sounds — roughly 22% of Kabardian's inventory overlaps with ACHUMAWI. Shared sounds are ones a speaker already knows from their native language and will generally produce and perceive accurately without explicit training.
The 49 sounds found only in Kabardian represent the greatest pronunciation challenge for ACHUMAWI 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, ACHUMAWI has 9 sounds not used in Kabardian. Native Kabardian speakers learning ACHUMAWI 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.