There are 18 words that start with 'citi'.
| citied | cities | 
| citify | citing | 
| citizen | citified | 
| citifies | citizens | 
| citifying | citizenly | 
| citizenry | citizeness | 
| citizenries | citizenship | 
| citification | citizenesses | 
| citizenships | citifications | 
Note: These 18 words that start with 'citi' are found from the USA & Canada version of the tournament Scrabble word list.