A person supported by another and giving him/her nothing in return

How to use word Parasite in Sentences? Some Examples

Unemployment is just like a parasite on any economy.
His pet dog has so many parasite therefore she went to a vet to get rid the dog from them.
Some parasites are so dangerous that they can cause death of their host.

Releated Sentences

A person who exploits the hospitality of the other especially by flattery.
An organism that lives on or in an organism of another species without contirbuting to their survival.

A person who knows everything	Omniscient
One who believes in God	Theist
One who speaks less	Reticent
A person who is above hundred years	Centenarian
One who loves mankind	Philanthropist
A speech delivered without any previous preparation	Extempore
One who knows many languages	Polyglot
One who is unable to pay his debts	Insolvent
One who eats too much	Glutton
A list of books	Catalogue
One who looks on the bright side of things	Optimist
One who is indifferent to pleasure or pain	Stoic
A handwriting that cannot be read	Illegible
One who believes in fate	Fatalist
People living at the same time	Contemporaries
One who looks on the dark side of things	Pessimist
A person difficult to please	Fastidious
A person who cannot read or write	Illiterate
A thing that is fit to be eaten	Edible
One who is present everywhere	Omnipresent
One who pretends to be what he is not	Hypocrite
A thing no longer in use	Obsolete
One who loves books	Bibliophile
A book written by an unknown author	Anonymous
Work for which no salary is paid	Honorary