Gall signifies the same thing as wormwood -- that is, infernal falsity.

(Referencat: Apocalypse Revealed 410)

'Rebel,' as in Genesis 14:4, relates to evils pertaining to a person, or to evil spirits, when they begin to arise and infest, after they have been in a state of subjection or servitude.

(Referencat: Arcana Coelestia 1660)