Parasite
/pˈɛrəˌsaɪt/
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Definition
(noun) 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.
Sentence Examples
You're nothing more than a social parasite!
The alien is a small intelligent multidimensional parasite that attaches to the host's nervous system.
CEFR Practice Quiz
The tapeworm is a ____ that lives inside the intestines of its host and absorbs nutrients.