The Oxford Learner's Dictionaries are an excellent resource for English learners.
https://www.oxfordlearnersdictionaries.com
speak - verb
https://www.oxfordlearnersdictionaries.com/definition/english/speak_1?q=speak
synonyms
[excerpt]
talk or speak?
Speak can suggest a more formal level of communication than talk. You speak to somebody about something to try to achieve a particular goal or to tell them to do something. You talk to somebody in order to be friendly or to ask their advice:
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Speak has to do with "utterance" and talk has to do with "conversation."
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