There are 18 words that start with 'omi'.
| omit | omits |
| omicron | omikron |
| ominous | omitted |
| omitter | omicrons |
| omikrons | omission |
| omissive | omitters |
| omitting | ominously |
| omissible | omissions |
| ominousness | ominousnesses |
Note: These 18 words that start with 'omi' are found from the USA & Canada version of the tournament Scrabble word list.