What this means for learners
AIZI and Makassar share 21 sounds — roughly 64% of Makassar's inventory overlaps with AIZI. Shared sounds are ones a speaker already knows from their native language and will generally produce and perceive accurately without explicit training.
The 2 sounds found only in Makassar represent the greatest pronunciation challenge for AIZI 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, AIZI has 12 sounds not used in Makassar. Native Makassar speakers learning AIZI 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.