gene vs genetical

gene is a noun but genetical is not a noun.

Word	Noun	Adjective	Verb	Adverb
gene	Yes	No	No	No
genetical	No	Yes	No	No

gene (noun)	genetical (noun)
(genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity

gene (adjective)	genetical (adjective)
	of or relating to the science of genetics
	of or relating to or produced by or being a gene