pseudopod vs pseudopodium

pseudopod and pseudopodium both are nouns.

Word	Noun	Adjective	Verb	Adverb
pseudopod	Yes	No	No	No
pseudopodium	Yes	No	No	No

As nouns, pseudopod and pseudopodium are synonyms defined as:

pseudopod and pseudopodium: temporary outgrowth used by some microorganisms as an organ of feeding or locomotion

pseudopod (noun)	pseudopodium (noun)
temporary outgrowth used by some microorganisms as an organ of feeding or locomotion	temporary outgrowth used by some microorganisms as an organ of feeding or locomotion