There are 15 words that start with 'interb'.
| interbed | interbank |
| interbeds | interbred |
| interbasin | interbreed |
| interbedded | interbranch |
| interbreeds | interbedding |
| interborough | interbehavior |
| interbreeding | interbehaviors |
| interbehavioral | |
Note: These 15 words that start with 'interb' are found from the USA & Canada version of the tournament Scrabble word list.