How do I access a variable from an instantiated class?

Question

I have the following class:

class Voice{
    constructor(){
        const SpeechRecognition =  window.SpeechRecognition || window.webkitSpeechRecognition;
     
        let recognition = new SpeechRecognition(); //criou uma instance
  
        recognition.onstart = () => {  //inicia quando aperta espaço
            //console.log("starting listening, speak in microphone");
        }
  
        recognition.onspeechend = () => {  //inicia quando para de ouvir pessoa falando
            //console.log("stopped listening");
            recognition.stop();
        }
  
        recognition.onresult = (result) => {   //mostra no console o resultado da frase falada atraves de uma arrow function
        var word = result.results[0][0].transcript;
        console.log(word);
         }             
         recognition.start();
    }
}

export {Voice};

So, I would like to instantiate the class Voice in the main class and access the variable "word".

In the main class, I've tried:

• function keyDown(e){  
      if (e.code=='Space'){
          let myWord = new Voice();
          console.log(myWord.word);
      }
  }
  

• function keyDown(e){  
      if (e.code=='Space'){
          //voice();
          let myWord = new Voice();
          console.log(`${myWord.word}`);
      }
  } 
  

For both attempts, I got "undefined" as a result.