Ender wrote:
Everything is called a cruiser, so it not a valid way of telling.
Which applies equally well to calling them destroyers because they are "Star Destroyers", or "Star Cruisers" for that matter. Doesn't really help your argument any, does it? Especialyl when there is in fact a vast difference in size and role between the ISD and the CC/Republic cruiser (Aside from the fact one is from the Empire and another is from the "Republic" which has nothing close to the Empire's Navy.)
We see larger ships titled "star Cruisers", not described as such. And thier role is identifed by comparing what they do in the movies and novels with the textbook definitions of the ship classes
You should really do some better research before you go spouting off facts.
1.) First off, the "Star Destroyer" designation, given its capitalization and reference (both in terms of "Star Destroyer" both in TESB and "Super Star Destroyer" in ROTJ) suggest they are merely titles. The same is equally true of "Star Cruiser". This can be further reinforced by the existence of ships called "Star Defenders" - are you suggesting there is a ship designation of "Defenders?"
2.) They are referred to as "Cruisers" or "Imperial cruisers", in all three of the OT novelizations. They are also labeled "cruisers" on the official SW.com website. You will note that such naming of "cruisers" is lowercase, not capitalized.
3.) The Liberty, the first ship destroyed by the second Death Star, was also labeled a "Star Cruiser", yet is comparable in size and dimensions to a Star Destroyer. For that matter, its inferred alot of smaller vessels are "Rebel Cruisers" or "Star Cruisers" as well (IE the fact that "Dozens" of "Cruisers" engaged the I mperial fleet, etc.) Furthermore we know most "Star Cruisers" are only 1.2-1.3 km long, typically. This fits more closely with my side than yours, in fact - the only difference being is that the ISD would simply be "light" cruiser (which I see no problem with concluding) and that much larger ships (such as perhaps the communications ship in ROTJ) are much larger cruisers. Seems to fit more with my argument than with yours, doesn't it?
So at best, even *IF* the naming is just coincidental regarding "Imperial cruisers" (unlikely given the evidence), your argument also falls flat over reason 1 and 3.
Secondly, regarding roles of the "Star Destroyer", correct me if I am wrong (and please provide sources in doing so) but are not destroyers small, agile warships primarily dedicated to defensive/escort/recon mission roles? They hunted submarines, swept for mines, provided AAA support and anti-torpedo support, and scouted for enemy vessels. Cruisers were also support ships, but were multi-role offensive and defensive ships expected to assist larger battleships in battle (at least by engaging enemy cruisers, if not supporting against larger ships). They also supported ground assault operations, acted independently as commerce raiders or in convoy escort They even carried limited numbers of craft/planes/helicopters in some cases, but also carried enough heavy armament and armor to be able to effectively slug it out. They were also fast, but not neccesarily agile. And on top of that, they could also serve as command and control vessels of sorts in certain variants, although this was certainly not their main role or requirement. For that matter, a cruiser is more likely to be mistaken for a battleship than a destroyer is (battlecruiser/heavy cruiser, anyone?)
So unless you can do better than this to prove me wrong, what we see and read in the canon and EU suggests something more along the lines of a cruiser than a destroyer.