City killer: A hurricane; a storm that can destroy a city.
Rust Saint: The scavenge god, the deity that scavengers pray to.
Half men: Aka "Dog faces," an engineered species, half-dog, half-man. Monstrous in appearance, physically strong and intelligent, half-men are often used as bodyguards to the powerful, or as killers in war.
Harvesters: Medical buyers of body parts
Life Cult: A religious cult that operates on blood offerings.
Swank: Something rich, costly, precious. Or, a person of the wealthy classes.
Scavenge: Anything that can be broken up and salvaged for profit.