There are 11 words that start with 'diagr'.
| diagram | diagrams |
| diagraph | diagramed |
| diagraphs | diagraming |
| diagrammed | diagramming |
| diagrammable | diagrammatic |
| diagrammatical | |
Note: These 11 words that start with 'diagr' are found from the USA & Canada version of the tournament Scrabble word list.