The raised portion of a submarine above the deck is called the Fairwater or Sail; its primary purpose is to house the Periscopes, Radio masts, Snorkel Masts, and other equipment in a streamlined enclosure. It also serves as the Bridge / Lookout station during underway surfaced operations.
In WWI/WWI submarines, the tower was known as the Conning Tower, as it was this area where the Commanding Officer would "Conn" (control) the boat during target tracking / attack situations.
The top part of a wave is called the crest, while the bottom part is called the trough.
The vertical part near the middle of the submarine is the sail. If you're talking about the fin at the very back it's the rudder.
The top part of a tornado is called "the top"
The top part of a dress is called the bodice.
The bottom part of your hand is the Palmar sideand the top part is the Dorsal side.
The submarine is manned by the crew, and crew members are called submariners.
The top part of a shirt is called the collar. It is the part that goes around the neck area.
Denominator. The top part is called the numerator.
The 'helmsman' steers a submarine.
The top part of a wave is called the crest. It is the highest point of the wave above the rest position.
The top part of a shoe is called the upper
The top part of a stalk would be the terminal bud or leaf.