There are 12 words that start with 'irrep'.
| irreparable | irreparably |
| irrepealable | irreplaceable |
| irreplaceably | irrepressible |
| irrepressibly | irreproachable |
| irreproachably | irreproducible |
| irreparableness | irrepealability |
Note: These 12 words that start with 'irrep' are found from the USA & Canada version of the tournament Scrabble word list.