There are 18 words that start with 'caes'.
| caesar | caesars | caesium | 
| caestus | caesura | caesiums | 
| caesurae | caesural | caesuras | 
| caesuric | caesarean | caesarian | 
| caesarism | caestuses | caesareans | 
| caesarians | caesarisms | caespitose | 
Note: These 18 words that start with 'caes' are found from the USA & Canada version of the tournament Scrabble word list.