invader
n. B2 Upper Intermediate US //ˌɪnˈveɪdɝ// UK //ɪnvˈeɪdɐ// in·vad·er
n. a person or group that enters a country or area without permission, usually to take control or cause trouble. You use this word when someone is attacking or taking over a place.
n. a person or group that enters a country or territory without authorization, typically with the intent to seize control or cause disruption. Often carries a political or military connotation.
The army fought hard to stop the enemy invader.
The local community organized a protest to welcome the peaceful invader and ensure their safety.
Historians often debate whether the group was a legitimate refugee seeking asylum or a foreign invader seeking to exploit the region's natural resources.
From invade + -er.