Looked it up in the dictionary: mdomo means lip or mouth.
I have submitted this to the devs
Yep. Mdomo specifically means the externally visible part of the mouth, the mouth as a facial feature (ie. the lips), as opposed to kinywa, which is the oral cavity.
Mouth is still being marked as incorrect. No one uses kinywa in conversational speech. This is not an anatomy class is it?
Mdomo is Mouth.
Lip is a part of mouth.
Mdomo can apply to both. 'kinywa' is specific to mouth