The Css Virgina
The Confederates had a ship called an Ironclad (one of the inventions of the Civil War) and this Ironclad ship was called the Merrimac. If you don't trust this answer then don't blame me, because that's what we learned in school.
The old wooden ship you are referring to is the USS Merrimack, which was scuttled by the Union Navy and later raised by the Confederates. They converted it into an ironclad warship, renaming it the CSS Virginia. This ship famously faced off against the USS Monitor in the first battle between ironclad warships during the Civil War.
The South's first ironclad warship was the CSS Virginia. This vessel was constructed from a sunken Union ship the USS Merrimack. The Confederates retooled the ship, added much armor and became the first ironclad warship of the US Civil War.
The Union Ironclad ship was the Monitor. The Confederate ship was the Virginia.
An ironclad was indeed a ship. They were built in two different ways. Let's take the Moitor and the Merrimac, or CSS Virginia as it was called by the Confederacy. The Monitor was built completely of steel. It was built with a very low draft and instead of the usual placement of guns along the sides of the ship, they built it with a turret in the middle of the ship with two cannon inside. The Virginia was initially a wooden ship. The Confederates covered the wooden hull with iron plating to convert it to an ironclad.
A ship is by itself never a weapon, and that also goes for an ironclad ship. The ironclad could only be called a weapon carrier.
Ironclad is a noun or used as an adjective and need not be capitalized. As example, the CSS Virginia was a ship that was an ironclad vessel.
Virginia
Monitor
The first Ironclad ship ever made was by the northern states during the civil war was named the Monitor.
a ship heavily armored in iron
it was a ship made of metal