First, a word about how my decision trees work. They reflect how I use these words, and that's not always the same as the way dictionaries define them. Often a dictionary will say two words mean the same thing - if I've made a distinction, I'm not disagreeing with the dictionary, I'm just saying that's how I've decided to use the words in question. Language being a living thing and all of that. I mention this because whenever I do one of these, someone (usually my very clever mother) will comment about how I'm incorrect. Please feel free to post about things I ought to've included or how your personal decision tree would be a little different, but understand I'm not trying to map English usage, I'm only mapping my own twisted subdialect of it. End Public Service Announcement.
On with the tree:
So, yes, I know every piece of available information says that a Dirigible is any steerable lighter-than-air vehicle and that it's identical with Airship, but I'll only ever apply the term to Zeppelins and Blimps, never to those damnable thermal airships.
On the Vagaries of Driving in the USA
5 hours ago