• astronate,
• austronaut,
• astronot,
• astronouts,
• austronauts,
• astronout,
• anstronaut,
• astronaught,
• astonaut,
• astronaunt,
• astronuat,
• astranaut,
• astronamy,
• astronute,
• asturnaut,
• astronut,
• astronant,
• astraunaut,
• atronaut,
• astronuts

• astrogator,
• astronomic,
• asteroidea,
• astropogon,
• astrometry,
• astrocyte,
• astrolatry,
• astronomy,
• ashtoreth,
• astronautics,
• astrantia,
• astroglia,
• astrocytic,
• astronomer,
• astronautic,
• astringent,
• astroloma,
• astrogate,
• austrotaxus,
• astrophyton,
• astronium.

The adjective form of the word "astronaut" is "astronautical".

The plural of the "astronaut" can be the "astronauts".

The singular of the "astronaut" can be the "astronaut".