There are 13 words that start with 'astron'.
| astronaut | astronomy |
| astronauts | astronomer |
| astronomic | astronautic |
| astronomers | astronomies |
| astronautics | astronomical |
| astronautical | astronomically |
| astronautically | |
Note: These 13 words that start with 'astron' are found from the USA & Canada version of the tournament Scrabble word list.