even ? when something is flat and level it is often referred to as an even surface.
A mesa has a flat top.
Level is a palindrome meaning flat or even.
A flat surface generally refers to a horizontal surface and is referred to as the plane.
Yes, "plane" is a noun; a word for a type of aircraft; a tool used to smooth the surface of wood; a flat surface; a level of development or existence; a word for a thing .The word "plane" is also a verb and an adjective.
The flat surface felt smooth.
It is an incline.
The noun 'flat' is a singular, common, concrete noun; a word for:an area of level land;the level surface of something;a shoe or slipper with a low or no heel;a shallow box used to start seedlings;a deflated tire;a one level apartment;a musical tone;an upright section of movable stage scenery;a word for a thing.The word 'flat' is also a verb, an adjective, and an adverb.