Capital ships. The Capitol is a building in Washington D.C.
What>? Spelling Police? Where's the BAN button!
Capit
ol
 The term for a town or city that serves as a seat of government is spelled capital. The term for the building in which a legislative assembly meets is spelled capitol.[/list]
So is a ship a city or a building?
It is a Middle English word.
Here's Capit
al
cap·i·tal1
n. 
1. a.A town or city that is the official seat of government in a political entity, such as a state or nation. 
 b. A city that is the center of a specific activity or industry: the financial capital of the world. 
2. a. Wealth in the form of money or property, used or accumulated in a business by a person, partnership, or corporation. 
 b. Material wealth used or available for use in the production of more wealth. 
 c. Human resources considered in terms of their contributions to an economy: “ 
[The] swift unveiling of his... plans provoked a flight of human capital” (George F. Will). 
3. Accounting. The remaining assets of a business after all liabilities have been deducted; net worth. 
4. Capital stock. 
5. Capitalists considered as a group or class. 
6. An asset or advantage: “profited from political capital accumulated by others” (Michael Mandelbaum). 
7. A capital letter. 
[/list] 
Perhaps I should put up a poll so we can vote on it...