Modifiers matching vermin:

• urban,
• dangerous,
• deadly,
• unwanted,
• vicious,
• poisonous,
• small,
• voracious,
• unwelcome,
• undesirable,

Simple categories matching vicious:

• monster,
• animal,
• critter,
• creature,
• mammal,
• predator,
• vermin,
• beast,