codefendant vs co-defendant

codefendant and co-defendant both are nouns.

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

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

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

codefendant (noun)	co-defendant (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