besieger

nouns

an enemy who lays siege to your position
besieger
is derived from
besiege
is a type of (narrower)
an armed adversary (especially a member of an opposing military force)
"a soldier must be prepared to kill his enemies"
enemy, foe, foeman, opposition
an energetic petitioner
besieger
is a type of (narrower)
one praying humbly for something
"a suppliant for her favors"
petitioner, requester, suppliant, supplicant