powder flask vs powder horn

powder flask and powder horn both are nouns.

Word	Noun	Adjective	Verb	Adverb
powder flask	Yes	No	No	No
powder horn	Yes	No	No	No

As nouns, powder flask and powder horn are synonyms defined as:

powder flask and powder horn: container for carrying gunpowder; made of the hollow horn of an animal

powder flask (noun)	powder horn (noun)
container for carrying gunpowder; made of the hollow horn of an animal	container for carrying gunpowder; made of the hollow horn of an animal