invader

noun

Etymology: Etymology tree English invade Proto-Indo-European *-yósder. Proto-Italic *-āzijos Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English invader From invade + -er.

1. One who invades a region.

   “He remarks on the growth of the pretensions of the invaders since the treaty between Alfred and Guthrum which put the Northern warriors only on the same level as the twelf[-]hyndmen, or ordinary thegns.”

   “The underroot tendril! We are at fault for giving the invader a path to Lady Brianna.”

2. An intruder (especially on someone's privacy).