Submarine vs. Underwater — What's the Difference?

A submarine (or sub) is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability.

Relating to, occurring, used, or performed beneath the surface of water.

A warship with a streamlined hull designed to operate completely submerged in the sea for long periods, equipped with a periscope and typically armed with torpedoes or missiles.

(Nautical) Below the water line of a vessel.

A sandwich made of a long roll typically filled with meat, cheese, and vegetables such as lettuce, tomato, and onions.

(not comparable) Beneath the surface of the water; of or pertaining to the region beneath the water surface.

Existing, occurring, or used under the surface of the sea

(nautical) Beneath the water line of a vessel.

(Nautical) A vessel that is capable of operating submerged.

(figuratively) In difficulty, especially financially.

A submarine sandwich.

(finance) Having negative equity; owing more on an asset than its market value.

(Baseball) A pitch that is thrown with a low sidearm or underhand motion.

(finance) Of an option, having a strike price higher (call options) or lower (put options) than the current market price of the underlying asset or financial product; for example, an option to buy shares at $20 when the current market price is $15.

Beneath the surface of the water; undersea.

So as to go beneath the surface of the water.

Thrown with or characterized by a low sidearm or underhand motion

(fishing) A type of lure which lies beneath the water surface.

To attack by submarine, especially with torpedoes.

To water or irrigate insufficiently.

(Sports) To knock down with a blow to the legs.

Beneath the surface of the water;

(Baseball) To pitch (a ball) with a low sidearm or underhand motion.

Growing or remaining under water;

To slide, drive, or be thrown under something

To ride in or serve as a crew member of a submarine.

Existing, relating to, or made for use beneath the sea.

Hidden or undisclosed.

(baseball) Of a pitch, thrown with the hand lower than the elbow.

A boat that can go underwater.

A kind of sandwich made in a long loaf of bread.

(baseball) A pitch delivered with an underhand motion.

Any submarine plant or animal.

(informal) A stowaway on a seagoing vessel.

(intransitive) To operate or serve on a submarine.

(transitive) To torpedo; to destroy with a sudden sneak attack.

To sink or submerge oneself.

To slide forwards underneath one's seat belt (during a crash or sudden stop).

Being, acting, or growing, under water in the sea; as, submarine navigators; submarine plants.

A submarine plant or animal.

A submarine boat; a ship that can travel under the surface of the water. Most such ships are ships of war, as part of a navy, but submarines are also used for oceanic research. Also called sub and (from the German U-Boot) U-boat.

A stowaway on a seagoing vessel.

A submarine sandwich.

A submersible warship usually armed with torpedoes

A large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States

Move forward or under in a sliding motion;

Throw with an underhand motion

Bring down with a blow to the legs

Control a submarine

Attack by submarine;

Beneath the surface of the sea