There are 14 words that start with 'aust'.
| austere | austral |
| austerer | australs |
| austenite | austerely |
| austerest | austerity |
| australes | austenites |
| austenitic | austereness |
| austerities | austerenesses |
Note: These 14 words that start with 'aust' are found from the USA & Canada version of the tournament Scrabble word list.