Two translator Apps indicate "arándanos" for both cranberries and blueberries.
One suggested "arándanos rojos" for cranberries, and "arándanos azules" for blueberries.
What are the words for such fruits in Spanish?
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I'm taking as granted that you want to know the difference between cranberries and blueberries in Spanish.
The blueberries refer to several species from the section Cyanococcus within the genus Vaccinium. One of those species, the vaccinium corymbosum, is what we know as arándano azul or just arándano. Nonetheless, it seems that the word arándano in Spanish refers to the vaccinium myrtillus, a species known in English as bilberry or European blueberry. In fact, the Spanish definition for arándano in the DRAE takes as granted that the fruit of the bush is blackish or bluish.
You are correct. The common translations are "arándanos rojos" and "arándanos azules"
In this page you could find more info in Spanish.
Both berries have this scientific names 'Vaccinium oxycoccus' for "rojos" and 'Vaccinium corymbosum' for the "azules" where the whole vaccinium family is called in Spanish "arándanos" o "bayas".
There are more than just blues and reds. There is also other colors like black (it is really dark red or dark purple) and those we call them "moras"
If you search images for "bayas" you will see all kinds of berries.