What this means for learners
Armenian and Sesotho share 24 sounds — roughly 52% of Sesotho's inventory overlaps with Armenian. Shared sounds are ones a speaker already knows from their native language and will generally produce and perceive accurately without explicit training.
The 22 sounds found only in Sesotho represent the greatest pronunciation challenge for Armenian 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, Armenian has 13 sounds not used in Sesotho. Native Sesotho speakers learning Armenian 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.