There are 18 words that start with 'calen'.
| calends | calendal | calendar |
| calender | calendars | calenders |
| calendric | calendula | calenture |
| calendared | calendered | calenderer |
| calendulas | calentures | calendaring |
| calenderers | calendering | calendrical |
Note: These 18 words that start with 'calen' are found from the USA & Canada version of the tournament Scrabble word list.