Modifiers matching ligand:

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

Simple categories matching atomic:

• grouping,
• system,
• material,
• position,
• motion,
• property,
• parameter,
• feature,
• dimension,
• ligand,
• particle,
• thing,
• vapor,
• gas,
• weight,
• liquid,
• group,
• event,
• force,
• element,
• agent,
• physics,
• imperfection,
• operations,
• entity,
• substance,
• research,
• unit,
• structure,
• process,
• number,
• hydrogen,
• migration,
• metal,
• interaction,
• core,
• volume,
• medium,
• isotope,
• information,
• distribution,
• phenomenon,
• values,
• resonance,
• oxygen,
• theory,
• component,
• change,
• atom,
• mass,
• fluid,
• value,
• composition,
• constituent,
• object,
• solute,
• transport,
• target,
• packing,
• quantity,
• field,
• matter,
• surface,
• aggregate,
• cluster,
• layer,
• instruction,
• domain,
• solid,
• attribute,
• crystal,
• bond,
• level,
• control,
• signal,