ola ---> sea wave, tsunami, or any other phenomenon that covers or sweeps a whole region (even figuratively)
ola marina
ola de calor
ola de delitos
onda ---> undulation (a wavelike curve or motion)
onda sonora
onda electromagnética
ondas (en la superficie del estanque)
buena/mala onda (old fashioned ---> good/bad vibe)
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