co-defendant vs codefendant

co-defendant and codefendant both are nouns.

Word	Noun	Adjective	Verb	Adverb
co-defendant	Yes	No	No	No
codefendant	Yes	No	No	No

As nouns, co-defendant and codefendant are synonyms defined as:

co-defendant and codefendant: a defendant who has been joined together with one or more other defendants in a single action

co-defendant (noun)	codefendant (noun)
a defendant who has been joined together with one or more other defendants in a single action	a defendant who has been joined together with one or more other defendants in a single action