There are 19 words that start with 'addi'.
| addict | adding | addible |
| addicts | addicted | addition |
| additive | additory | addicting |
| addiction | addictive | additions |
| additives | addictions | additional |
| additively | additivity | additionally |
| additivities | ||
Note: These 19 words that start with 'addi' are found from the USA & Canada version of the tournament Scrabble word list.