radiolarian vs actinopod

radiolarian and actinopod both are nouns.

Word	Noun	Adjective	Verb	Adverb
radiolarian	Yes	No	No	No
actinopod	Yes	No	No	No

As nouns, actinopod is a hypernym of radiolarian; that is, actinopod is a word with a broader meaning than radiolarian:

radiolarian: protozoa with amoeba-like bodies and radiating filamentous pseudopods
actinopod: protozoa having stiff rodlike radiating pseudopods

radiolarian (noun)	actinopod (noun)
protozoa with amoeba-like bodies and radiating filamentous pseudopods	protozoa having stiff rodlike radiating pseudopods