Modifiers matching ligand:

• complementary,
• simple,
• hydrophobic,
• soft,
• natural,
• endogenous,
• synthetic,
• weak,
• exogenous,
• psychoactive,
• acidic,
• additional,
• metal,
• functional,
• ancillary,
• physiologic,
• small,
• binding,
• anionic,
• physiological,
• organic,
• complex,
• lipophilic,
• cationic,
• biological,
• charged,
• common,
• base,
• uncharged,
• atomic,
• environmental,
• psychedelic,
• relevant,
• ionic,
• neutral,
• axial,
• strong,
• active,
• nonmetal,
• important,
• inorganic,
• nonsteroidal,
• external,
• polar,
• extracellular,
• hydrophilic,
• hard,
• bound,
• cellular,
• potent,

Simple categories matching polar:

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