There are 16 words that start with 'sickl'.
| sickle | sickly | sickled | 
| sickles | sicklied | sicklier | 
| sicklies | sicklily | sickling | 
| sicklemia | sicklemic | sickliest | 
| sicklying | sicklemias | sickliness | 
| sicklinesses | ||
Note: These 16 words that start with 'sickl' are found from the USA & Canada version of the tournament Scrabble word list.