There are 12 words that start with 'metast'.
| metastable | metastably |
| metastases | metastasis |
| metastatic | metastasize |
| metastasized | metastasizes |
| metastability | metastasizing |
| metastatically | metastabilities |
Note: These 12 words that start with 'metast' are found from the USA & Canada version of the tournament Scrabble word list.