The "bulb of vestibule" refers to the rounded, fleshy structure located at the entrance of the vagina in females. While it's a medical term used by healthcare professionals, there are several synonyms that people can use in everyday language to refer to this structure, including the vaginal bulb, vestibular bulb, vaginal vestibular bulb, and bulbous vestibule. These terms essentially describe the same thing and are used interchangeably to refer to the swelling or engorgement that occurs in the soft tissues of the vestibule during sexual arousal. So, whether you're reading medical literature or having a casual conversation, there are different ways to refer to the "bulb of vestibule".