Modifiers matching spider:

• poisonous,
• harmless,
• larger,
• smaller,
• large,
• primitive,
• venomous,

Simple categories matching harmless:

• powder,
• task,
• animal,
• substance,
• contaminant,
• organism,
• thing,
• liquid,
• impurity,
• pollutant,
• creature,
• insect,
• material,
• solid,
• spider,
• constituent,
• ingredient,
• bird,
• matter,
• preparation,
• metabolite,
• object,
• chemical,
• item,
• medication,
• prey,
• being,
• foodstuff,
• souvenir,
• activity,
• stuff,
• gas,
• bug,
• agent,
• disorder,
• critter,
• sugar,
• particle,
• metal,
• salt,
• residue,
• component,
• carrier,
• plant,
• crime,
• preservative,
• fluid,
• drug,
• rodent,
• neighbor,
• antigen,
• snake,
• allergen,
• compound,
• food,