There are 13 words that start with 'gero'.
| gerontic | gerontocrat |
| gerontology | gerontocracy |
| gerontocrats | gerontologic |
| gerontocratic | gerontologies |
| gerontologist | gerontocracies |
| gerontological | gerontologists |
| gerontomorphic | |
Note: These 13 words that start with 'gero' are found from the USA & Canada version of the tournament Scrabble word list.