cracker -
a programmer who cracks (gains unauthorized access to) computers, typically to do malicious things; "crackers are often mistakenly called hackers"
firework,
pyrotechnic (usually plural) a device with an explosive that burns at a low rate and with colored flames; can be used to illuminate areas or send signals etc.
cracker -
An impoverished white person from the southeastern United States, originally associated with Georgia and parts of Florida; by any white person.