ectozoan vs epizoan

ectozoan and epizoan both are nouns.

Word	Noun	Adjective	Verb	Adverb
ectozoan	Yes	Yes	No	No
epizoan	Yes	Yes	No	No

As adjectives, ectozoan and epizoan are synonyms defined as:

As nouns, ectozoan and epizoan are synonyms defined as:

Other synonyms of ectozoan include ectoparasite, ectozoon, epizoon.

ectozoan (noun)	epizoan (noun)
any external parasitic organism (as fleas)	any external parasitic organism (as fleas)

ectozoan (adjective)	epizoan (adjective)
of or relating to epizoa	of or relating to epizoa