Modifiers matching germ:

• sensitive,
• airborne,
• little,
• harmful,
• larger,
• pathogenic,
• noxious,
• extracellular,
• large,
• nasty,
• microscopic,
• common,
• opportunistic,
• significant,
• gastrointestinal,
• invisible,
• possible,
• conventional,
• dangerous,
• unwanted,
• bad,
• smaller,
• infectious,
• small,

Simple categories matching nasty:

• critter,
• stuff,
• thing,
• condition,
• animal,
• chemical,
• disease,
• content,
• compound,
• creature,
• predator,
• illness,
• cause,
• component,
• std,
• disorder,
• material,
• preservative,
• microbe,
• item,
• weather,
• germ,
• parasite,
• contaminant,
• software,
• pest,
• pathogen,
• bacteria,
• program,
• bug,
• infection,
• sickness,
• beast,
• weapon,
• emotion,
• vice,
• substance,
• virus,
• allergen,
• happening,
• insect,