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QUICK ANSWER
"What time" is a form of "what time", a phrase which is often translated as "a qué hora". "When" is an adverb which is often translated as "cuándo". Learn more about the difference between "what time" and "when" below.
what time()
A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
when()
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g., The cat and the dog slept.).
2. (relative)