@extra-wordnet.english/adverb-exceptions/index.js

Adverb exceptions of English WordNet as Map.

const ADV_EXC = new Map([
  ["best", "well"],
  ["better", "well"],
  ["deeper", "deeply"],
  ["farther", "far"],
  ["further", "far"],
  ["harder", "hard"],
  ["hardest", "hard"]
]);
module.exports = ADV_EXC;