assailant
encroacher
intruder
interloper
trespasser
adventurer
ally
barbarian
cavalry
chieftain
conqueror
foe
horde
immigrant
invasion
marauder
pirate
raider
rebel
refugee
ruler
settler
soldiery
tribe
tyrant
warrior
Nader
Nadir
Seder
blockader
crusader
evader
fader
grader
lader
nadir
seder
shader
spader
trader
wader