The difference between Root and Screw

Root as a noun:

The part of a plant, generally underground, that anchors and supports the plant body, absorbs and stores water and nutrients, and in some plants is able to perform vegetative reproduction.

Root as a noun:

A root vegetable.

Root as a noun:

The part of a tooth extending into the bone holding the tooth in place.

Root as a noun:

The part of a hair under the skin that holds the hair in place.

Root as a noun:

The part of a hair near the skin that has not been dyed, permed, or otherwise treated.

Root as a noun:

The primary source; origin.

Root as a noun (arithmetic):

Of a number or expression, a number which, when raised to a specified power, yields the specified number or expression.

Root as a noun (arithmetic):

A square root (understood if no power is specified; in which case, “the root of” is often abbreviated to “root”).

Root as a noun (analysis):

A zero (of an equation).

Root as a noun (graph theory, computing):

The single node of a tree that has no parent.

Root as a noun (linguistic morphology):

The primary lexical unit of a word, which carries the most significant aspects of semantic content and cannot be reduced into smaller constituents. Inflectional stems often derive from roots.

Root as a noun (philology):

A word from which another word or words are derived.

Root as a noun (music):

The fundamental tone of any chord; the tone from whose harmonics, or overtones, a chord is composed.

Root as a noun:

The lowest place, position, or part.

Root as a noun (computing):

In UNIX terminology, the first user account with complete access to the operating system and its configuration, found at the root of the directory structure; the person who manages accounts on a UNIX system.

Root as a noun (computing):

The highest directory of a directory structure which may contain both files and subdirectories.

Root as a noun (slang):

A penis, especially the base of a penis.

Root as a verb:

To fix the root; to enter the earth, as roots; to take root and begin to grow.

Root as a verb:

To be firmly fixed; to be established.

Root as a verb (computing, slang, transitive):

To break into a computer system and obtain root access.

Root as a verb (ambitransitive):

To turn up or dig with the snout.

Root as a verb (by extension):

To seek favour or advancement by low arts or grovelling servility; to fawn.

Root as a verb (intransitive):

To rummage; to search as if by digging in soil.

Root as a verb (transitive):

To root out; to abolish.

Root as a verb (Australia, New Zealand, Ireland, vulgar, slang):

To have sexual intercourse.

Root as a verb (horticulture, intransitive):

To grow roots

Root as a verb (horticulture, transitive):

To prepare, oversee, or otherwise cause the rooting of cuttings

Root as a noun (Australia, New Zealand, vulgar, slang):

An act of sexual intercourse.

Root as a noun (Australia, New Zealand, vulgar, slang):

A sexual partner.

Root as a verb (intransitive, with "for" or "on", US):

To cheer (on); to show support (for) and hope for the success of.

Screw as a noun (nautical):

A device that has a helical function. A simple machine, a helical inclined plane. A (usually) metal fastener consisting of a shank partially or completely threaded shank, sometimes with a threaded point, and a head used to both hold the top material and to drive the screw either directly into a soft material or into a prepared hole. A ship's propeller. An Archimedes screw. A steam vessel propelled by a screw instead of wheels.

Screw as a noun (derogatory):

A prison guard.

Screw as a noun (derogatory):

An extortioner; a sharp bargainer; a skinflint.

Screw as a noun (US, slang, dated):

An instructor who examines with great or unnecessary severity; also, a searching or strict examination of a student by an instructor.

Screw as a noun (vulgar, slang):

Sexual intercourse; the act of screwing.

Screw as a noun (vulgar, slang):

A casual sexual partner.

Screw as a noun (slang):

Salary, wages.

Screw as a noun (billiards):

Backspin.

Screw as a noun (slang):

A small packet of tobacco.

Screw as a noun (dated):

An old, worn-out, unsound and worthless horse.

Screw as a noun (math):

A straight line in space with which a definite linear magnitude termed the pitch is associated. It is used to express the displacement of a rigid body, which may always be made to consist of a rotation about an axis combined with a translation parallel to that axis.

Screw as a noun:

An amphipod crustacean.

Screw as a verb (transitive):

To connect or assemble pieces using a screw.

Screw as a verb (transitive, vulgar, slang):

To have sexual intercourse with.

Screw as a verb (transitive, slang):

To cheat someone or ruin their chances in a game or other situation. Sometimes used in the form "screw over".

Screw as a verb (transitive):

To apply pressure on; to put the screws on.

Screw as a verb:

To practice extortion upon; to oppress by unreasonable or extortionate exactions.

Screw as a verb (transitive):

To contort.

Screw as a verb (soccer, transitive):

To miskick (a ball) by hitting it with the wrong part of the foot.

Screw as a verb (billiard, snooker, pool):

To screw back.

Screw as a verb (US, slang, dated):

To examine (a student) rigidly; to subject to a severe examination.