Only in !XU 114
What this means for learners
!XU and Navaho share 27 sounds — roughly 19% of Navaho's inventory overlaps with !XU. Shared sounds are ones a speaker already knows from their native language and will generally produce and perceive accurately without explicit training.
The 27 sounds found only in Navaho represent the greatest pronunciation challenge for !XU 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, !XU has 114 sounds not used in Navaho. Native Navaho speakers learning !XU 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.