coda vs ending

coda and ending both are nouns.

Word	Noun	Adjective	Verb	Adverb
coda	Yes	No	No	No
ending	Yes	No	No	No

As nouns, ending is a hypernym of coda; that is, ending is a word with a broader meaning than coda:

Other hypernyms of coda include close, closing, conclusion, end.

coda (noun)	ending (noun)
the closing section of a musical composition	the act of ending something
	the end of a word (a suffix or inflectional ending or final morpheme)
	the last section of a communication
	event whose occurrence ends something
	the point in time at which something ends