Extraterrestrial and Outlandish

Extraterrestrial adjective - Originating, located, or occurring outside Earth or its atmosphere.

Outlandish and extraterrestrial are semantically related. In some cases you can use "Outlandish" instead an adjective "Extraterrestrial".

Outlandish adjective - Different from the ordinary in a way that causes curiosity or suspicion.

Extraterrestrial and outlandish are semantically related. Sometimes you can use "Extraterrestrial" instead an adjective "Outlandish".