As nouns the difference between moder and voder
is that moder is mother while voder is voice operation demonstrator - an electronic device that is capable of producing a recognizable approximation of speech.
voder
English
Noun
(
en noun)
Voice Operation Demonstrator - An electronic device that is capable of producing a recognizable approximation of speech.
References
* Miriam Websters Third New International Dictionary (Unabridged) 1993