double-barreled vs double-barrelled

double-barreled and double-barrelled both are adjectives.

Word	Noun	Adjective	Verb	Adverb
double-barreled	No	Yes	No	No
double-barrelled	No	Yes	No	No

As adjectives, double-barreled and double-barrelled are synonyms defined as:

double-barreled and double-barrelled: having two barrels mounted side by side

As adjectives, double-barreled and double-barrelled are synonyms defined as:

double-barreled (adjective)	double-barrelled (adjective)
having two barrels mounted side by side	having two barrels mounted side by side
having two purposes; twofold	having two purposes; twofold