rhizopodan vs amoeba

rhizopodan and amoeba both are nouns.

Word	Noun	Adjective	Verb	Adverb
rhizopodan	Yes	No	No	No
amoeba	Yes	No	No	No

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

rhizopodan: protozoa characterized by a pseudopod
amoeba: naked freshwater or marine or parasitic protozoa that form temporary pseudopods for feeding and locomotion

Other hyponyms of rhizopodan include ameba, foram, foraminifer, testacean.

rhizopodan (noun)	amoeba (noun)
protozoa characterized by a pseudopod	naked freshwater or marine or parasitic protozoa that form temporary pseudopods for feeding and locomotion