There are 13 words that start with 'undula'.
| undular | undulant | undulate |
| undulance | undulated | undulates |
| undulator | undulances | undulating |
| undulation | undulators | undulatory |
| undulations | ||
Note: These 13 words that start with 'undula' are found from the USA & Canada version of the tournament Scrabble word list.