Close:
* baybee (a common pronunciation)
* bebby (a common misspelling)
Similar:
* babe
* bee
* bay
* bi (short for "bicycle")
Rhyming:
* cabby
* lobby
* shabby
Slightly similar:
* maybe
* raby (not a real word)
* laby (not a real word)
It's important to note that the similarity in sound depends on the speaker's accent and pronunciation.