Roofer
Roofers repair leaks in roofs.
This roofer is on the roof of a house.
She is standing on a ladder.
Plumber
Plumbers fix water problems.
This plumber is fixing a stopped up toilet.
He is holding a plunger.
Bricklayer
Bricklayers build houses, apartments, fences, and fireplaces with bricks.
This bricklayer is building a fence.