What this means for learners
Yánesha and Croatian share 19 sounds — roughly 53% of Croatian's inventory overlaps with Yánesha. 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 Croatian represent the greatest pronunciation challenge for Yánesha 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, Yánesha has 14 sounds not used in Croatian. Native Croatian speakers learning Yánesha 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.