rhizopod vs testacean

rhizopod and testacean both are nouns.

Word	Noun	Adjective	Verb	Adverb
rhizopod	Yes	No	No	No
testacean	Yes	No	No	No

As nouns, testacean is a hyponym of rhizopod; that is, testacean is a word with a more specific, narrower meaning than rhizopod:

rhizopod: protozoa characterized by a pseudopod
testacean: any of various rhizopods of the order Testacea characterized by having a shell

Other hyponyms of rhizopod include ameba, amoeba, foram, foraminifer.

rhizopod (noun)	testacean (noun)
protozoa characterized by a pseudopod	any of various rhizopods of the order Testacea characterized by having a shell