Common words:
* astound: to surprise or amaze greatly
* astronomy: the study of celestial objects
* asteroid: a small rocky body orbiting the sun
* astral: relating to the stars or constellations
* astrology: the study of the supposed influence of celestial objects on human affairs
* astute: having or showing an ability to accurately assess situations or people
Less common words:
* astralize: to transform into a star or constellation
* asterisk: a symbol (*) used in writing or printing
* asterism: a group of stars that form a recognizable pattern
* astral body: a celestial object, especially a star or planet
* astral projection: the supposed ability to project one's consciousness out of the body
* astral travel: the supposed ability to travel outside the body to other realms or dimensions
* astral plane: a supposed spiritual realm or dimension
There are other words, but these are some of the most common and well-known.