Filter out Certain Words and Match only EXACT Words

I have an array of all stock symbols. When a user posts the message 'TSLA will open green tomorrow.', I want to detect the word 'TSLA'. But the problem is my code is also detecting 'T', 'S', and 'LA', since those are all valid stock symbols.

So I created a list of prohibited symbols consisting of every capital letter from A to Z. But I don’t know how to apply it.

const url = 'https://dumbstockapi.com/stock?format=tickers-only&exchange=NASDAQ,NYSE,AMEX';
const bodyArray = [];
const blockedList = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.split('');

request(url, (error, { statusCode }, body) => {
  return error ? console.log(error) : statusCode == 200 ? bodyArray.push(JSON.parse(body)) : 0;
});

client.on('message', msg => {
  const { content, author: { tag } } = msg;
  const [arr] = bodyArray;
  const blocked = arr.indexOf(word => content.toUpperCase().includes(word) > -1);
  if (blocked.length) {
    console.log(`${tag} used a word in list.`);
    return msg.delete().catch(console.error);
  }
});

const string = 'TSLA will open green tomorrow.  LA will too.';
const symbols = ['T', 'S', 'LA', 'TSLA'];
const regExpString = String.raw`b`+ symbols.join(String.raw`b|b`);
const regExp = new RegExp(regExpString, 'gi');
const matches = string.match(regExp);

console.log(matches); // [ 'TSLA', 'LA' ]