As nouns the difference between mesozoan and parazoan
is that mesozoan is any worm-like, marine parasite of the phylum mesozoa while parazoan is (zoology) any sponge (of the subkingdom parazoa).
mesozoan
English
Noun
(
en noun)
Any worm-like, marine parasite of the phylum Mesozoa .
parazoan
English
Noun
(
en noun)
(zoology) Any sponge (of the subkingdom Parazoa)