There are 12 words that start with 'demar'.
| demark | demarks | demarche | 
| demarked | demarcate | demarches | 
| demarking | demarcated | demarcates | 
| demarcating | demarcation | demarcations | 
Note: These 12 words that start with 'demar' are found from the USA & Canada version of the tournament Scrabble word list.