is a specific kind of: natural phenomenon.

is a broader term that covers: acoustic phenomenon | atmospheric phenomenon | boundary layer | chaos | cloud | decalescence | electrical phenomenon | electricity | energy | energy, free energy | power | event | field, field of force, force field | force | hysteresis | resonance | mechanical phenomenon | opacity | optical phenomenon | force per unit area, pressure, pressure level | reflection, reflexion | refraction | resolution, resolving power | resolution | conduction, conductivity | propagation | fundamental interaction, interaction | surface tension | syzygy | transparence, transparency | turbulence, turbulency | chop | floatation, flotation ... show more.