>As long as you're not using modern US Navy designations... Frigates
>are now small, and some Destroyers are bigger (size and weight) than
>most Cruisers... *sigh*

Destroyers were never meant to be a size designation, but a mission designation. The original name was "submarine destroyer", as it was a dedicated ASW platform. They were small because they needed to be maneuverable, and didn't need the stability a huge ship gives you (since they mounted depth charges rather than ship-rocking guns). However, there has been some creeping missionism in the past few decades.

--rR