Ruler vs. Straightedge — What's the Difference?

A ruler, sometimes called a rule or line gauge, is a device used in geometry and technical drawing, as well as the engineering and construction industries, to measure distances or draw straight lines.

A straightedge or straight edge is a tool used for drawing straight lines, or checking their straightness. If it has equally spaced markings along its length, it is usually called a ruler.

One, such as a monarch or dictator, that rules or governs.

A rigid flat rectangular bar, as of wood or metal, with a straight edge for testing or drawing straight lines.

A straightedged strip, as of wood or metal, for drawing straight lines and measuring lengths. Also called rule.

Having a level, even edge

A (usually rigid), flat, rectangular measuring or drawing device with graduations in units of measurement; a straightedge with markings.

Abstaining from alcohol, tobacco, and drugs.

A person who rules or governs; someone or something that exercises dominion or controlling power over others.

(informal) Living one's life opposing or eschewing the use of substances such as alcohol, tobacco, and drugs.

(transitive) To beat with a ruler (as a traditional school punishment).

A flat, rectangular tool used to draw, cut or check the straightness of straight lines.

One who rules; one who exercises sway or authority; a governor.

A board, or piece of wood or metal, having one edge perfectly straight, - used to ascertain whether a line is straight or a surface even, and for drawing straight lines.

Measuring stick consisting of a strip of wood or metal or plastic with a straight edge that is used for drawing straight lines and measuring lengths

Hand tool consisting of a flat rigid rectangular bar (metal or wood) that can be used to draw straight lines (or test their straightness)

A person who rules or commands;