There are 13 12-letter words that start with 'peri'.
| pericarditis | perichondral | perichondria |
| perilousness | periodically | periodontics |
| periodontist | perionychium | peripatetics |
| peripherally | periphrastic | peritoneally |
| peritrichous | ||
Note: These 13 12-letter words that start with 'peri' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with perio, perip, peris, peric, perit, peril, perid, perig, perim, perin, peria, periw, perih, perik, perib, periq.
5-letter words start with 'peri' (2)