Steamer or Steamship

Steamer is an early term for any vessel power by a steam engine rather than sails.

Shipwreck Delaware
The Delaware, an 1880s screw steamer

Early steamers were propelled by large paddlewheels. "Side-wheelers", with the paddlewheels on each side, were more seaworthy, and therefore more common in ocean waters, while "stern-wheelers", with a single large paddlewheel at the back, were more common as riverboats. Later, these were replaced by more efficient screw (or propeller) vessels.

Shipwreck Black Warrior
The Black Warrior, an 1850s side-paddlewheel steamer. There are no stern-wheelers in the region that I know of.
Click
This sketch of the Delaware shows the remains that you can expect to find of such a vessel.

Of note is the universal pattern of:

< bow - boilers - engine - drive shaft - propeller - rudder/stern )

and the fact that the boilers are always in front of the engine. Identify any one of these features on the wreck, and you can orient yourself in even the murkiest conditions.

Shipwreck Delaware boiler
Boilers on the Delaware. In the foreground is an intact one. Next to that is a collapsed one; there are four altogether. In the background is the engine.
steam engine
An old postcard of the City of Keansburg, the last of the New York commuter ferries, and one of the last steamships to ply local waters - until 1968.
steam engine
One of the Keansburg's two triple-expansion steam engines, at Allaire State Park.

Shipwreck Thurmond
The unusual submarine-like hull form of a whale-back steamer. Sea-keeping was poor, and the design was ultimately not successful, and died out.
Type:
shipwreck, "whale-back" steamer, USA
Built:
1890, AmShip Superior, Duluth MN USA, as Colgate Hoyt
Specs:
( 276 x 36 ft ) 1253 displacement tons
Sunk:
Saturday December 25, 1909
ran aground in thick fog - 10 casualties
Depth:
14 ft

Shipwreck Rusland
The Rusland, aground, with onlookers.
Type:
Adonis - shipwreck, wood-hulled bark
Rusland - shipwreck, iron-hulled steamer, England
Built:
Adonis - 1853, Germany
Rusland - 1872, Scotland, as Kenilworth
Specs:
Adonis - 550 tons, 12 crew
Rusland - ( 345 x 37 ft ) 2538 gross tons, ~200 passengers & crew
Depth:
25 ft
Sunk:
Adonis - Tuesday March 8, 1859 - ran aground in bad weather, no casualties
Rusland - Saturday March 17, 1877 - ran aground in bad weather, no casualties

Shipwreck Larchmont
Type:
shipwreck, steamer, USA
Built:
1885, Goss & Sawyer, Bath ME USA
Specs:
( 252 x 37 ft ) 1605 tons, 351 passengers & crew
Sunk:
Monday February 11, 1907
collision with schooner Harry Knowlton - 334 casualties
Depth:
140 ft

huge paddlewheels; wooden hull draped with fishing nets; hazardous currents & poor viz.