mitochondrion vs cell organ

mitochondrion and cell organ both are nouns.

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

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

mitochondrion: an organelle containing enzymes responsible for producing energy
cell organ: a specialized part of a cell; analogous to an organ

Other hypernyms of mitochondrion include cell organelle, organelle.

mitochondrion (noun)	cell organ (noun)
an organelle containing enzymes responsible for producing energy	a specialized part of a cell; analogous to an organ