mitochondrion vs organelle

mitochondrion and organelle both are nouns.

Word	Noun	Adjective	Verb	Adverb
mitochondrion	Yes	No	No	No
organelle	Yes	No	No	No

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

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

Other hypernyms of mitochondrion include cell organ, cell organelle.

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