There are 13 13-letter words that start with 'demo'.
| democratizers | democratizing | 
| demodulations | demographical | 
| demolishments | demolitionist | 
| demonizations | demonological | 
| demonologists | demonstrating | 
| demonstration | demonstrative | 
| demonstrators | |
Note: These 13 13-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)