I dunno.
If I remember correctly, blimps and dirigibles are both lighter-than-air aircraft held up by large bags of helium or hydrogen, as opposed to hot air. However, a blimp is basically a big, slightly more aerodynamic balloon with a cabin on the bottom and some propellers, while a dirigible has a rigid skeleton. Dirigibles are also usually much bigger.
I ask again, blimp or dirigible?