There are 14 words that start with 'irrel'.
| irrelative | irrelevant |
| irreligion | irrelevance |
| irrelevancy | irreligions |
| irreligious | irrelatively |
| irrelevances | irrelevantly |
| irrelevancies | irreligionist |
| irreligiously | irreligionists |
Note: These 14 words that start with 'irrel' are found from the USA & Canada version of the tournament Scrabble word list.