There are 7 14-letter words that start with 'ast'.
| asthenospheres | asthenospheric |
| astrobiologies | astrobiologist |
| astrologically | astronomically |
| astrophysicist | |
Note: These 7 14-letter words that start with 'ast' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with astr, asto, aste, asth, asti, asta, astu, asty.
5-letter words start with 'ast' (2)