There are 13 words that start with 'perox'.
| peroxy | peroxid | peroxide |
| peroxids | peroxided | peroxides |
| peroxidic | peroxidase | peroxiding |
| peroxisome | peroxidases | peroxisomal |
| peroxisomes | ||
Note: These 13 words that start with 'perox' are found from the USA & Canada version of the tournament Scrabble word list.