entozoic vs entozoan

entozoic is not a noun while entozoan is a noun.

Word	Noun	Adjective	Verb	Adverb
entozoic	No	Yes	No	No
entozoan	Yes	Yes	No	No

As adjectives, entozoic and entozoan are synonyms defined as:

entozoic and entozoan: living within a living animal usually as a parasite

Other synonyms of entozoic include endozoic.

entozoic (noun)	entozoan (noun)
	any of various parasites that live in the internal organs of animals (especially intestinal worms)

entozoic (adjective)	entozoan (adjective)
living within a living animal usually as a parasite	living within a living animal usually as a parasite
	of or relating to entozoa