Puns are likely to be particularly problematic, as they depend on how words and phrases sound. That, however, is something that is intuitively obvious to all of

Puns are likely to be particularly problematic, as they depend on how words and phrases sound. That, however, is something that is intuitively obvious to all of us who can hear, so everyday conversation, and therefore the training corpus, is not likely to say much about which words are near-homophones.