A friend or mate
A person who maintains railway lines.
Someone who fiddles or tinkers with things.
An ostler; one who looks after the horses in a mine.
Someone whose job is to sand and grind small imperfections from metal and ceramic castings.
One's sibling or kin via a godfamily tie: one's or one's child's godparent, or one's godchild's parent, or one's godparent's child.