The difference between Mast and Pylon

Mast as a noun:

A tall, slim post or tower, usually tapering upward, used to support, for example, the sails on a ship, flags, floodlights, or communications equipment such as an aerial, usually supported by guy-wires.

Mast as a noun (naval):

A non-judicial punishment ("NJP") disciplinary hearing under which a commanding officer studies and disposes of cases involving those under his command.

Mast as a verb:

To supply and fit a mast to a ship

Mast as a noun:

The fruit of forest-trees (beech, oak, chestnut, pecan, etc.), especially if having fallen from the tree, used as fodder for pigs and other animals.

Mast as a verb (of swine and other animals):

To feed on forest seed or fruit.

Mast as a verb (agriculture, forestry, ecology, of a population of plants):

To vary fruit and seed production in multi-year cycles.

Pylon as a noun:

A gateway to the inner part of an Ancient Egyptian temple.

Pylon as a noun:

A tower-like structure, usually one of a series, used to support high-voltage electricity cables.

Pylon as a noun (aviation):

A structure used to mount engines, missiles etc., to the underside of an aircraft wing or fuselage.

Pylon as a noun (aviation, historical):

A starting derrick for an aeroplane.

Pylon as a noun (aviation, historical):

A post, tower, etc. as on an aerodrome, or flying ground, serving to bound or mark a prescribed course of flight.

Pylon as a noun:

An obelisk.

Pylon as a noun:

A traffic cone.

Pylon as a noun (American football):

An orange marker designating one of the four corners of the end zone in American football.