A person having a tendency to take advantage of the help of others, especially if making little effort to help themselves.
A person who lives on other people's efforts or expense and gives little or nothing back.
A sycophant or hanger-on.
An organism that lives on or in another organism of a different species, deriving benefit from living on or in that other organism, while not contributing towards that other organism sufficiently to cover the cost to that other organism.
A climbing plant which is supported by a wall, trellis etc.
A retainer or companion of an ancient Celtic warrior, who praised him in song or poetry at gatherings; a bard.
A component of a composite aircraft which is carried aloft and air-launched by a larger carrier aircraft or mother ship to support the primary mission of the carrier.
Lice, fleas, ticks and mites are widely spread parasites.