As nouns the difference between mast and mist
is that
mast is 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 while
mist is water or other liquid finely suspended in air.
As verbs the difference between mast and mist
is that
mast is to supply and fit a mast to a ship while
mist is to form mist.
As an initialism MAST
is initialism for military antishock trousers; inflatable trousers that apply pressure to the inferior half of a patient's body to decrease bloodloss and prevent the onset of shock similar to a tourniquet.