animalculum vs organism

animalculum and organism both are nouns.

Word	Noun	Adjective	Verb	Adverb
animalculum	Yes	No	No	No
organism	Yes	No	No	No

As nouns, organism is a hypernym of animalculum; that is, organism is a word with a broader meaning than animalculum:

animalculum: microscopic organism such as an amoeba or paramecium
organism: a living thing that has (or can develop) the ability to act or function independently

Other hypernyms of animalculum include being.

animalculum (noun)	organism (noun)
microscopic organism such as an amoeba or paramecium	a living thing that has (or can develop) the ability to act or function independently
	a system considered analogous in structure or function to a living body