There are 16 words that start with 'recti'.
| recti | rectify | 
| rectified | rectifier | 
| rectifies | rectitude | 
| rectifiers | rectifying | 
| rectitudes | rectifiable | 
| rectilinear | rectification | 
| rectilinearly | rectitudinous | 
| rectifiability | rectifications | 
Note: These 16 words that start with 'recti' are found from the USA & Canada version of the tournament Scrabble word list.