Originally Posted by Neil S. Bulk
They're never called "Star Destroyers" in that movie. They always say, "Imperial cruiser". The term has never appeared in any version of the Star Wars
I'm pretty sure they are... I'm doing this from memory, but when they leave Tatooine in a hurry, Luke asks Han what's going on, and Han responds "Star Destroyers, two of 'em, headed right for us" or something to that effect.
In fact, I think "Imperial Cruiser" is the lesser-spoken term, since it's only used when talking about Han's lost spice shipment.