One who comes to a place or organisation with which they have no previous connection with the sole or primary aim of personal gain, especially political or financial gain.
A migrant from the Northern to the Southern States after the American Civil War of 1861–5, especially one who went South to gain political influence.
A person who actively seeks or takes advantage of opportunities.
A person who subsists on still-edible food that has been or was going to be discarded.
One who will generally eat whatever is available, having a diet that excludes few foods.