There are 10 words that start with 'demod'.
| demode | demoded | 
| demodulate | demodulated | 
| demodulates | demodulator | 
| demodulating | demodulation | 
| demodulators | demodulations | 
Note: These 10 words that start with 'demod' are found from the USA & Canada version of the tournament Scrabble word list.