What this means for learners
NONI and Lao share 21 sounds — roughly 50% of Lao's inventory overlaps with NONI. Shared sounds are ones a speaker already knows from their native language and will generally produce and perceive accurately without explicit training.
The 21 sounds found only in Lao represent the greatest pronunciation challenge for NONI 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, NONI has 12 sounds not used in Lao. Native Lao speakers learning NONI 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.