nucleole vs cell organ

nucleole and cell organ both are nouns.

Word	Noun	Adjective	Verb	Adverb
nucleole	Yes	No	No	No
cell organ	Yes	No	No	No

As nouns, cell organ is a hypernym of nucleole; that is, cell organ is a word with a broader meaning than nucleole:

nucleole: a small round body of protein in a cell nucleus; such organelles contain RNA and are involved in protein synthesis
cell organ: a specialized part of a cell; analogous to an organ

Other hypernyms of nucleole include cell organelle, organelle.

nucleole (noun)	cell organ (noun)
a small round body of protein in a cell nucleus; such organelles contain RNA and are involved in protein synthesis	a specialized part of a cell; analogous to an organ