Astronomic and Vast

Astronomic adjective - Relating or belonging to the science of astronomy.

Vast and astronomic are semantically related in huge topic. In some cases you can use "Vast" instead an adjective "Astronomic", when it comes to topics like very large.

Nearby Words: astronomical, astronomically, astronomy, astronomer

Vast adjective - Unusually large.

Astronomic and vast are semantically related in mega topic. You can use "Astronomic" instead an adjective "Vast". informal substitute

Nearby Words: vastly, vasty