Ectorganism :: Ectorganism (n.) An external parasitic organism.
Entorganism :: Entorganism (n.) An internal parasitic organism.
Microorganism :: Microorganism (n.) Any microscopic form of life; -- particularly applied to bacteria and similar organisms, esp. such are supposed to cause infectious diseases..
Organism :: Organism (n.) An organized being; a living body, either vegetable or animal, compozed of different organs or parts with functions which are separate, but mutually dependent, and essential to the life of the individual..
Organist :: Organist (n.) One who plays on the organ.
Organist :: Organist (n.) One of the priests who organized or sung in parts.
Organista :: Organista (n.) Any one of several South American wrens, noted for the sweetness of their song..
Protoorganism :: Protoorganism (n.) An organism whose nature is so difficult to determine that it might be referred to either the animal or the vegetable kingdom.