What this means for learners
Wik Mungkan and Adzera share 10 sounds — roughly 38% of Adzera's inventory overlaps with Wik Mungkan. Shared sounds are ones a speaker already knows from their native language and will generally produce and perceive accurately without explicit training.
The 15 sounds found only in Adzera represent the greatest pronunciation challenge for Wik Mungkan 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, Wik Mungkan has 16 sounds not used in Adzera. Native Adzera speakers learning Wik Mungkan 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.