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"Highest" is a form of "highest", a phrase which is often translated as "más alto". "Biggest" is a form of "biggest", an adjective which is often translated as "más grande". Learn more about the difference between "highest" and "biggest" below.
highest
A phrase is a group of words commonly used together (e.g., once upon a time).
a. más alto
That supermarket has the highest prices compared to all the others in the city.Ese supermercado tiene los precios más altos en comparación con los demás de la ciudad.
biggest(
bih
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gihst
)An adjective is a word that describes a noun (e.g., the big dog).
b. mayor
I like this house. But my biggest concern is its location.Me gusta esta casa. Pero mi mayor preocupación es su localización.
c. más extenso
Jason has the best sales territory and the biggest.Jason tiene el mejor territorio de ventas y el más extenso.
a. más grande
Sometimes the smallest ideas have the biggest impact.A veces, las ideas más pequeñas tienen el efecto más grande.
b. mayor
The employees with seniority have the biggest responsibilities.Los empleados con antigüedad tienen las mayores responsabilidades.