Ewe

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Example from SoWL of contrasting bilabial and labiodental fricatives. Ewe, which is spoken in Ghana, is one of several West African languages exhibiting this contrast.

S éɸé
S éfá
S ɛ̀βɛ̀
S èvè

See L&M (139-142) for detailed discussion of articulation and acoustics.
Notes on the sonagrams: High frequency energy is weaker in the bilabials.
L&M report more lowering of F2 for the bilabials, but this is hardly visible here.