Aphonic and Mum

Aphonic adjective - Being without sound through injury or illness and thus incapable of all but whispered speech.

Mum and aphonic are semantically related. In some cases you can use "Mum" instead an adjective "Aphonic".

Mum adjective - Deliberately refraining from speech.

Aphonic and mum are semantically related. Sometimes you can use "Aphonic" instead an adjective "Mum".