There are 15 words that start with 'disag'.
| disagree | disagreed | 
| disagrees | disagreeing | 
| disaggregate | disagreeable | 
| disagreeably | disagreement | 
| disaggregated | disaggregates | 
| disagreements | disaggregating | 
| disaggregation | disaggregative | 
| disaggregations | |
Note: These 15 words that start with 'disag' are found from the USA & Canada version of the tournament Scrabble word list.