What's the cardinality of the intersection of the English dictionary and npm package names?

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npmWords.js

const names = require('all-the-package-names');
const dictionary = require('dictionary-en');

dictionary((err, { dic: buf }) => {
  if (err) throw err;
  const words = new Set(buf.toString().split('\n'));

  const count = names.filter(name => words.has(name)).length;
  console.log(`${count}/${words.size} ≈ ${count / words.size}`);
});

As of 2022-07-04, 1587 npm package names are valid English words, accounting for ≈3.2% of hunspell's English dictionary.