pavilion
Synonym discussion
Sense: noun/4
For noun/4, pavilion usually means a large temporary structure at a fair, expo, or festival. Tent is the broad everyday word and can describe anything from a small camping shelter to a big event space. Marquee, especially in British English, suggests a large tent rented for weddings or formal events. Booth is much smaller and is mainly for selling, displaying, or giving information. Hall usually describes a permanent indoor building, so it often does not fit expo scenes. You might visit the Japan pavilion at a world fair, buy tickets at a booth nearby, and later eat in a marquee set up for guests.
Etymology
Pavilion came into English through French from Latin papilio, a word that could mean both a butterfly and a tent. The tent meaning probably grew from the image of cloth spread out like wings. English first used pavilion for a tent or temporary shelter, and later extended it to sports buildings, exhibition structures, and decorative park shelters.