i Register
In some senses, bridge-builder is marked as idiomatic. Watch for register when choosing this word.
noun
A builder of bridges.
A person who establishes friendly relations between parties.
A longtime advocate for racial and social justice with a degree from Virginia Commonwealth University, Walker, 40, got into politics at the urging of Edwards, an African American woman widely praised as a bridge-builder between the city’s haves and have-nots.