There are 19 words that start with 'mediat'.
| mediate | mediated | mediates | 
| mediator | mediately | mediating | 
| mediation | mediative | mediatize | 
| mediators | mediatory | mediatrix | 
| mediations | mediatized | mediatizes | 
| mediational | mediatizing | mediatrices | 
| mediatrixes | ||
Note: These 19 words that start with 'mediat' are found from the USA & Canada version of the tournament Scrabble word list.