There are 20 words that start with 'quas'.
| quash | quasi |
| quass | quasar |
| quasars | quashed |
| quasher | quashes |
| quasses | quassia |
| quassin | quashers |
| quashing | quassias |
| quassins | quasicrystal |
| quasicrystals | quasiparticle |
| quasiperiodic | quasiparticles |
Note: These 20 words that start with 'quas' are found from the USA & Canada version of the tournament Scrabble word list.