vs
QUICK ANSWER
"What" is a form of "what", a pronoun which is often translated as "qué". "When" is an adverb which is often translated as "cuándo". Learn more about the difference between "when" and "what" below.
when(
wehn
)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)
what(
wuht
)A pronoun is a word that stands in for a noun (e.g., she).
An adjective is a word that describes a noun (e.g., the big dog).
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
