There are 17 10-letter words that start with 'demo'.
| demobilize | democratic | demodulate | 
| demography | demoiselle | demolished | 
| demolisher | demolishes | demolition | 
| demonesses | demonetize | demoniacal | 
| demonising | demonizing | demonology | 
| demoralize | demounting | |
Note: These 17 10-letter words that start with 'demo' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with demon, democ, demol, demob, demod, demot, demor, demog, demou, demoi, demos, demoe.
5-letter words start with 'demo' (3)