TIL all blimps are dirigibles, but not all dirigibles are blimps
TIL all blimps are dirigibles, but not all dirigibles are blimps
www.airships.net Airships, Dirigibles, Zeppelins, & Blimps:What's the Difference? | Airships.net
What is an Airship? An airship is any powered, steerable aircraft that it is inflated with a gas that is lighter than air. What is a Dirigible? “Airship” and...

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Dirigibles or airships are powered, steerable aircraft using lighter-than-air gas to get their lift. Rigid (or semi-rigid) airships have some kind of internal structure to make their shape. Blimps don't.