"Único" is an adjective which is often translated as "only", and "solo" is an adjective which is often translated as "alone". Learn more about the difference between "único" and "solo" below.
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An adjective is a word that describes a noun (e.g. the big dog).
4. (related to coffee)
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).