pseudopodium vs appendage

pseudopodium and appendage both are nouns.

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

As nouns, appendage is a hypernym of pseudopodium; that is, appendage is a word with a broader meaning than pseudopodium:

pseudopodium: temporary outgrowth used by some microorganisms as an organ of feeding or locomotion
appendage: a natural prolongation or projection from a part of an organism either animal or plant

Other hypernyms of pseudopodium include outgrowth, process.

pseudopodium (noun)	appendage (noun)
temporary outgrowth used by some microorganisms as an organ of feeding or locomotion	a part that is joined to something larger
	an external body part that projects from the body
	a natural prolongation or projection from a part of an organism either animal or plant