invader Definition

invade
verb invaded, invading

tr & intr
1. To enter (a country) by force with an army.
tr & intr
2. To attack or overrun.

Example: Angry supporters invaded the pitch
Thesaurus: raid, assail, seize, swarm over, attack, penetrate, overrun, descend upon, assault, infest, encroach.
3. To interfere with (a person's rights, privacy, etc). See also invasion.

Derivative: invader
noun

Someone who enters somewhere, especially a country, by force
Thesaurus: trespasser, raider, intruder, attacker, aggressor.

Etymology: 15c: from Latin invadere.