parasite vs. parasitoid

an organism that lives on or in an organism of another species, known as the host, from the body of which it obtains nutriment.

a person who receives support, advantage, or the like, from another or others without giving any useful or proper return, as one who lives on the hospitality of others:

(in ancient Greece) a person who received free meals in return for amusing or impudent conversation, flattering remarks, etc.

an organism that practices parasitoidism.

of or relating to a parasite, especially one practicing parasitoidism.