Parasitism

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There’s nothing symbiotic about a parasitic relationship.

Symbiots essentially benefit each other with their respective attributes. There are some plants that are like this, and a number of bacteria in the human body.

Parasites are entities that gain advantage while the host is disadvantaged.

Parasites and symbiots are close to opposite ends of a spectrum.

Symbiosis: the condition in which two or more dissimilar organisms live together in close association. This includes parasitism (harmful to one of the organisms, beneficial to the other) commensalism (beneficial to one, of no significance to the other) and mutualism (beneficial to both). Look it up.

Parasitism is a type of symbiotic relationship in which one organism (the parasite) gains an advantage whilst the other (the host) is disadvantaged. An example is the sea louse which lives on wild fish and feeds off their flesh.