There are 12 15-letter words that start with 'interc'.
| interchangeable | interchangeably |
| intercollegiate | intercommunions |
| intercomparison | interconnecting |
| interconnection | interconversion |
| interconverting | intercorrelated |
| intercorrelates | interculturally |
Note: These 12 15-letter words that start with 'interc' are found from the USA & Canada version of the tournament Scrabble word list.