Modifiers matching diluent:

• inert,
• dissolved,
• ordinary,
• reactive,
• innocuous,
• volatile,
• suitable,
• liquid,
• aliphatic,
• organic,
• polar,

Simple categories matching polar:

• medium,
• contaminant,
• reagent,
• group,
• compound,
• substance,
• hormone,
• solvent,
• elastomer,
• impurity,
• particle,
• metabolite,
• residue,
• unit,
• fluid,
• solute,
• insulator,
• metal,
• constituent,
• lubricant,
• rubber,
• fiber,
• monomer,
• dielectric,
• reactant,
• chemical,
• substrate,
• drug,
• liquid,
• surface,
• molecule,
• adhesive,
• material,
• organism,
• animal,
• plastic,
• pesticide,
• radical,
• bird,
• region,
• polymer,
• component,
• moiety,
• ligand,
• activator,
• macromolecule,
• lipid,
• bond,
• contamination,
• volatile,
• protein,
• resin,
• intermediate,
• portion,
• mammal,
• nutrient,
• solid,
• gas,
• base,
• derivative,
• diluent,
• fauna,
• fraction,
• oil,
• sorbent,
• structure,
• atom,