organelle vs cell organ

organelle and cell organ both are nouns.

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

As nouns, organelle and cell organ are synonyms defined as:

organelle and cell organ: a specialized part of a cell; analogous to an organ

Other synonyms of organelle include cell organelle.

organelle (noun)	cell organ (noun)
a specialized part of a cell; analogous to an organ	a specialized part of a cell; analogous to an organ