firecracker vs banger

firecracker and banger both are nouns.

Word	Noun	Adjective	Verb	Adverb
firecracker	Yes	No	No	No
banger	Yes	No	No	No

As nouns, firecracker and banger are synonyms defined as:

firecracker and banger: firework consisting of a small explosive charge and fuse in a heavy paper casing

Other synonyms of firecracker include cracker.

firecracker (noun)	banger (noun)
firework consisting of a small explosive charge and fuse in a heavy paper casing	firework consisting of a small explosive charge and fuse in a heavy paper casing
	(British informal) pork sausage