central vs centrical

central is a noun but centrical is not a noun.

Word	Noun	Adjective	Verb	Adverb
central	Yes	Yes	No	No
centrical	No	Yes	No	No

central (noun)	centrical (noun)
a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication

central (adjective)	centrical (adjective)
in or near a center or constituting a center; the inner area	having or situated at or near a center
serving as an essential component