There are some words that might be used in a context that could be interpreted as a homophone for "bald", but they aren't true homophones. For example:
* "Bold" could be used in a context where someone is being bold about their baldness, but the two words don't sound exactly the same.
* "Ball" could be used in a humorous context, like "He's got a shiny ball head", but it's not a serious replacement for "bald".
Ultimately, there is no perfect homophone for "bald".