Builder's rhymes with:
builders, builders', rebuilders, bewilders, builders, builders', childers, gilder's, guilder's, guilders, rebuilders
Builder's sounds like:
balderas, baldric, baldrige, balladur's, beladur's, bellwethers, bewilders, bladders, blowdries, blowdryers, blowtorch, blowtorches, boulders, builders, builders'