AFAIK there’s no equivalent word for alien in French. The concept is different. Everything coming from space is automatically extraterrestrial. If it’s coming from earth, it’s just a strange/different species or a different form of life. The vagueness of alien doesn’t translate well in French, unless we use the word ‘alien’.
Every language is like this. Any given word can mean multiple things.
AFAIK there’s no equivalent word for alien in French. The concept is different. Everything coming from space is automatically extraterrestrial. If it’s coming from earth, it’s just a strange/different species or a different form of life. The vagueness of alien doesn’t translate well in French, unless we use the word ‘alien’.
Which is ironic, because while the modern French word was borrowed from English, the English word is from Old French.