chat vs speak

chat

verb
  • To talk of; to discuss. 

  • To talk more than a few words. 

  • To be engaged in informal conversation. 

  • To exchange text or voice messages in real time through a computer network, as if having a face-to-face conversation. 

noun
  • A louse (small, parasitic insect). 

  • Any of various small Old World passerine birds in the muscicapid tribe Saxicolini or subfamily Saxicolinae that feed on insects. 

  • A chat room. 

  • An exchange of text or voice messages in real time through a computer network, resembling a face-to-face conversation. 

  • A small potato, such as is given to swine. 

  • Mining waste from lead and zinc mines. 

  • Informal conversation. 

  • The entirety of users in a chat room or a single member thereof. 

  • Any of several small Australian honeyeaters in the genus Epthianura. 

  • A conversation to stop an argument or settle a situation. 

speak

verb
  • To have a conversation. 

  • To communicate with one's voice, to say words out loud. 

  • To understand (as though it were a language). 

  • To utter. 

  • To produce a sound; to sound. 

  • To be able to communicate in a language. 

  • Of a bird, to be able to vocally reproduce words or phrases from a human language. 

  • To deliver a message to a group; to deliver a speech. 

  • To be able to communicate in the manner of specialists in a field. 

  • To communicate or converse by some means other than orally, such as writing or facial expressions. 

  • To communicate (some fact or feeling); to bespeak, to indicate. 

noun
  • Speech, conversation. 

  • language, jargon, or terminology used uniquely in a particular environment or group. 

How often have the words chat and speak occurred in a corpus of books? (source: Google Ngram Viewer )