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According to my dictionary (Webster's):

A level surface is one that is flat and even
A smooth surface is one with no rough parts or bumps
A flat surface is one that is smooth, level, or even

I searched a lot but the websites didn't really give me a full understanding as to how these words are exactly different. What I learned from the sources here and there is:

A level surface has no slope
A smooth surface has no rough parts
A flat slope has no curves or bumps and no slope

I'd like to know if my deduction is correct. Here are more questions:

  1. Can a surface be flat but not level?
  2. Can a surface be smooth but not level?
  3. Can a surface be flat but not smooth?
  4. What about an even surface? Is it one with no slope? Is it one with no bumps? Or both?

closed as too broad by user3169, Nathan Tuggy, Em., P. E. Dant, JavaLatte Oct 30 '16 at 9:55

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    What is the difference between flat, straight, level and smooth? wonkeedonkeetools.co.uk/engineers-straight-edges/… – user5267 Oct 29 '16 at 22:13
  • @AbsoluteBeginner Oh, that kinda answered most of my questions! Some remain unanswered though – Englishfreak Oct 29 '16 at 22:23
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    This is more than a single question. You are more likely to receive a useful answer if you ask questions one at a time. The only way to answer all of them, though, is to consult multiple dictionaries and then to read and understand the usage examples. In order, the answers to your "more questions" are: Yes, Yes, Yes, Not necessarily, Probably, Not always. – P. E. Dant Oct 29 '16 at 22:39
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Naturally in English, as in other languages, certain words have many synonyms -- many of which as similar, but not necessarily the same. The best way to learn the exact definitions is to notice what things the words are used with.

"Flat" refers to a surface that is generally planar (forming a plane in space), in that it does not curve. A table is usually flat, a wall can be flat, and a television screen (nowadays) is flat. An angled surface may be flat as long as it does not curve up or down.

Sometimes flat is used to mean horizontal as in "lie flat", but a horizontal surface is not necessarily a flat surface.

"Level", on the other hand, implies flatness but usually means perpendicular to the force of gravity. A level surface is one which does not significantly curve up or down from side to side. A tennis court is level (and also flat) because one side is not higher than the other. A building should be constructed so that all the horizontal beams are level. Something that is balanced over a fulcrum will be level.

"Smooth" relates to the surface quality. A flat surface can be rough (bumpy to the touch) or smooth -- but if it is smooth and level, we might call it perfectly flat. The surface of a ping-pong ball is smooth. Someone's skin might be said to be smooth (if it is free from blemish). An ice skating rink will be relatively smooth, as well as flat and level.

"Even" is a little more general. An even surface might be level, or smooth, or flat. Even simply refers to the fact that the object appears similar from one side to the other If you compare different parts of the surface there should be no marks or imperfections or significant differences in one part that there are not in another. The surface doesn't have to be smooth, but if not, the texture should be regular.

An example of an even surface is a grassy sports field. The grass makes it a rough surface, but there are minimal differences between one part of the surface and another.

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