cube vs cubical

cube is a noun but cubical is not a noun.

Word	Noun	Adjective	Verb	Adverb
cube	Yes	No	Yes	No
cubical	No	Yes	No	No

cube (noun)	cubical (noun)
a block in the (approximate) shape of a cube
any of several tropical American woody plants of the genus Lonchocarpus whose roots are used locally as a fish poison and commercially as a source of rotenone
the product of three equal terms
a hexahedron with six equal squares as faces
a three-dimensional shape with six square or rectangular sides

cube (adjective)	cubical (adjective)
	shaped like a cube

cube (verb)	cubical (verb)
raise to the third power
cut into cubes