Synonyms:
invader, encroacher
Meaning: someone who enters by force in order to conquer
Usage examples
But if the invader be gone after plundering the country, that city shall be the enemy of Lacedaemon and Athens, and shall be chastised by both, and one shall not make peace without the other.
And that is one reason why the Little Contemptibles grew and grew until they became a mighty barrier stretching across the pathway of the invader from sea to sea, and saying with their Allies: