opera cloak vs opera hood

opera cloak and opera hood both are nouns.

Word	Noun	Adjective	Verb	Adverb
opera cloak	Yes	No	No	No
opera hood	Yes	No	No	No

As nouns, opera cloak and opera hood are synonyms defined as:

opera cloak (noun)	opera hood (noun)
a large cloak worn over evening clothes	a large cloak worn over evening clothes