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Discover LudwigThe phrase "alien invader" is correct and usable in written English.
It can be used in contexts related to science fiction, discussions about extraterrestrial life, or metaphorically to describe an unwelcome presence.
Example: "In the movie, the alien invader wreaked havoc on the small town, leaving the residents in a state of panic."
Alternatives: "extraterrestrial intruder" or "foreign invader".
Exact(23)
DENVER — Got an alien invader plant species?
A good hard freeze, which many of the "alien invader species," as he calls them, would be unlikely to survive.
Like the Canada goose and ring-necked parakeet, it is an alien invader, albeit one of a much earlier vintage.
Instead, for the past seven years they have relentlessly attacked him as if he were some sort of alien invader.
This electrifying sci-fi masterpiece from Glazer starred Scarlett Johannson as the alien invader in Glasgow, preying on credulous horny males.
Some – including the government – find it a nightmare weed, an alien invader with gaudy flowers and a noxious pong, a thug bullying native plants and swamping habitats.
Similar(37)
Alien invaders?
Alien invaders or genetically enhanced apes?
GETTING rid of alien invaders is hard.
They are alien invaders, to be resisted and rooted out.
The Kaiju are, as alien invaders tend to be, quite hostile.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com