linear vs cubic

linear and cubic both are adjectives.

Word	Noun	Adjective	Verb	Adverb
linear	No	Yes	No	No
cubic	No	Yes	No	No

linear (adjective)	cubic (adjective)
of or in or along or relating to a line; involving or having a single dimension	having the shape of a cube; having three dimensions
designating or involving an equation whose terms are of the first degree	involving the cube and no higher power of a quantity or variable
of a circuit or device having an output that is proportional to the input
measured lengthwise
(of a leaf shape) long and narrow