Alvand / Mowj Class - Schematics

Iran calls these ships "destroyers" but they would be classed as a corvette or light Frigate by the reckoning of all other countries. There are no hard and fast rules in these matters, but a Frigate would typically be in the range of about 5,000 tons, and a destroyer would be upwards of 7,500 to 10,000 tons. The American DDG-1000 destroyers displace 14,000 tons.

American DDG-1000 14,000 ton destroyer