There are 14 words that start with 'sust'.
| sustain | sustains |
| sustained | sustainer |
| sustainers | sustaining |
| sustenance | sustainable |
| sustainedly | sustenances |
| sustentation | sustentative |
| sustentations | sustainability |
Note: These 14 words that start with 'sust' are found from the USA & Canada version of the tournament Scrabble word list.