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Yes, "crowbar" is a common noun. It refers to a type of tool used for leveraging and prying objects apart.
A crowbar is a pry tool it's design has been refined to be as useful as possible in as many situations as possible.
The original tool, the "crow" was invented in the 1400s, while the term "crowbar" didn't come into use until the 1700s.
· chisel
· circular saw
· crowbar
With a special tool resembling a crowbar