Modifiers matching propagation:

• light,
• nonlinear,

Simple categories matching nonlinear:

• science,
• system,
• equation,
• transformation,
• structure,
• operator,
• converter,
• fluid,
• amplifier,
• device,
• problem,
• medium,
• material,
• concept,
• plant,
• solution,
• circuit,
• variation,
• crystal,
• property,
• mass,
• distortion,
• phenomenon,
• method,
• circuitry,
• process,
• wave,
• function,
• polymer,
• model,
• event,
• conductor,
• propagation,
• component,
• behavior,
• quality,
• scale,
• relationship,
• dielectric,
• regression,