Outdoor Equipment - https://familycamptents.com/what-is-a-camping-tents- vestibule/ Many tents on the market come with one or more vestibules, so I think it is a good idea to have the term camping tent's vestibule described in
Skydome™ 2-Person Camping Tent with Full-Fly Vestibule, Evergreen | Coleman
What is a Tent Vestibule? - SectionHiker.com
Camping Tent Vestibules & Porches | REI Co-op
Big Agnes Big House 6 Vestibule Tent Accessory – The Backpacker