There are 20 words that start with 'peta'.
| petal | petals | petard |
| petaled | petards | petasos |
| petasus | petabyte | petaline |
| petalled | petalody | petaloid |
| petalous | petabytes | petahertz |
| petallike | petasoses | petasuses |
| petalodies | petahertzes | |
Note: These 20 words that start with 'peta' are found from the USA & Canada version of the tournament Scrabble word list.