The difference between Directed edge and Loop

Directed edge as a noun (graph theory):

An edge of a directed graph.

Loop as a noun:

A length of thread, line or rope that is doubled over to make an opening.

Loop as a noun:

The opening so formed.

Loop as a noun:

A shape produced by a curve that bends around and crosses itself.

Loop as a noun:

A ring road or beltway.

Loop as a noun:

An endless strip of tape or film allowing continuous repetition.

Loop as a noun:

A complete circuit for an electric current.

Loop as a noun (programming):

A programmed sequence of instructions that is repeated until or while a particular condition is satisfied.

Loop as a noun (graph theory):

An edge that begins and ends on the same vertex.

Loop as a noun (topology):

A path that starts and ends at the same point.

Loop as a noun (transportation):

A bus or rail route, walking route, etc. that starts and ends at the same point.

Loop as a noun (algebra):

A quasigroup with an identity element.

Loop as a noun:

A loop-shaped intrauterine device.

Loop as a noun:

An aerobatic maneuver in which an aircraft flies a circular path in a vertical plane.

Loop as a noun:

A small, narrow opening; a loophole.

Loop as a noun:

(mass of iron).

Loop as a noun (biochemistry):

A flexible region in a protein's secondary structure.

Loop as a verb (transitive):

To form something into a loop.

Loop as a verb (transitive):

To fasten or encircle something with a loop.

Loop as a verb (transitive):

To fly an aircraft in a loop.

Loop as a verb (transitive):

To move something in a loop.

Loop as a verb (transitive):

To join electrical components to complete a circuit.

Loop as a verb (transitive):

To duplicate the route of a pipeline.

Loop as a verb (transitive):

To create an error in a computer program so that it runs in an endless loop and the computer freezes up.

Loop as a verb (intransitive):

To form a loop.

Loop as a verb (intransitive):

To move in a loop.