Contraphones
Some words are homophones, meaning they verbally sound the exact same as another word even though they're spelled differently. A few of these homophones are actually also antonyms, meaning they sound the exact same as another word with the totally opposite meaning!
- accepting/excepting
- raise/raze
- reckless/wreckless
Contronyms
It's also worth noting that many words have a homonymic antonym, meaning they're also spelled the exact same. Surprisingly, this is much more common and thus less interesting, but some examples are "dust", "cleave", "inflammable", "enjoin", "overlook", "sanction", "fast", "rent", and "peruse".