granite
Edifice is a 7 letter word for building.
Charlie.
estuary
A 7-letter word that can be another name for a convention is "meeting." It refers to a gathering of people for discussion or decision-making on specific topics.
acrylic
Whitney Whitney
Pelican
peacock
Bluejay
highboy
The word is the animal name "opossum."
The word Mollusk is a 7 letter word.