Synonyms of invader

3 Syllables
trespasser, trespassers, encroacher, infringer, assailant, enemies, bushwhacker, attacker, intruders, gate-crasher, bushwhackers, intruder, aggressors, enemy, alien, asperser, aliens, aggressor
4 Syllables
gatecrashers, gatecrasher, interrupter, interferer, interrupters, noncitizen