"What is it?" is a phrase which is often translated as "¿qué es?", and "yes" is an interjection which is often translated as "sí". Learn more about the difference between "What is it?" and "yes" below.
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An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g. Wow!).
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).