Someone
who interviews people is an interviewer.
Someone who plays football is a football player.
Someone
who eats well is a good eater.
Someone who paints houses is a painter.
Someone who sleeps
well is a good sleeper.
Someone who rules the country is a ruler.
Someone who kills animals
is a killer.
Someone who explores new lands is a explorer.
Someone who makes or repairs
shoes is a shoemaker.
Someone who always causes trouble is a trouble maker.
Someone who makes
clothes as a job is a dressmaker.
Someone who makes films is a filmmaker.
Someone who has
travelled to another ... is a traveller.