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"Qué bonito" is a phrase which is often translated as "how pretty", and "bello" is an adjective which is often translated as "beautiful". Learn more about the difference between "qué bonito" and "bello" below.
A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
An adjective is a word that describes a noun (e.g., the big dog).