what

pronoun
  1. used to ask for information about something
  2. Usage: interrogative
  3. the thing or things that
  4. Usage: relative
determiner
  1. used to ask about the identity or nature of someone or something
  2. Usage: interrogative
  3. used to indicate the entire amount of something
adverb
  1. to what extent or degree
interjection
  1. used to express surprise or ask someone to repeat something
  2. Usage: informal

Examples