linear vs planar

linear and planar both are adjectives.

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

linear (adjective)	planar (adjective)
of or in or along or relating to a line; involving or having a single dimension	involving or having two dimensions
designating or involving an equation whose terms are of the first degree
of a circuit or device having an output that is proportional to the input
measured lengthwise
(of a leaf shape) long and narrow