Dreadnought warbird

In starship classification, the dreadnought warbird was a type of dreadnought based on cruiser warbird classes. In the early 25th century, this designation usually included physically large, powerful starships. It referred to dreadnought cruisers of Romulan manufacture. It included tier 5 and tier 6-rated vessels. 

List of dreadnought warbird classes

 * Thrai Dreadnought Warbird
 * Romulan Republic Falchion Dreadnought Warbird
 * Romulan Scimitar Dreadnought Warbird
 * Romulan Republic Tulwar Dreadnought Warbird
 * Romulan Republic Flambard Science Dreadnought Warbird
 * Romulan Republic Khopesh Tactical Dreadnought Warbird
 * Romulan Republic Shamshir Operations Dreadnought Warbird
 * Romulan Republic Flambard Science Dreadnought Warbird
 * Romulan Republic Khopesh Tactical Dreadnought Warbird
 * Romulan Republic Shamshir Operations Dreadnought Warbird
 * Romulan Republic Khopesh Tactical Dreadnought Warbird
 * Romulan Republic Shamshir Operations Dreadnought Warbird
 * Romulan Republic Shamshir Operations Dreadnought Warbird

Variations
The tier-6 versions of the Scimitar-derived flagships were geared towards to science, tactical and operations layout, respectively.