pyrotechnical vs pyrotechnic

pyrotechnical is not a noun while pyrotechnic is a noun.

Word	Noun	Adjective	Verb	Adverb
pyrotechnical	No	Yes	No	No
pyrotechnic	Yes	Yes	No	No

As adjectives, pyrotechnical and pyrotechnic are synonyms defined as:

pyrotechnical and pyrotechnic: of or relating to the craft of making fireworks

pyrotechnical (noun)	pyrotechnic (noun)
	(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.

pyrotechnical (adjective)	pyrotechnic (adjective)
of or relating to the craft of making fireworks	of or relating to the craft of making fireworks
	suggestive of fireworks