There are 8 14-letter words that start with 'demo'.
| demobilization | democratically | 
| demolitionists | demonetization | 
| demonstrations | demonstratives | 
| demoralization | demoralizingly | 
Note: These 8 14-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)