A dirigible is a type of AIRSHIP that is powered and steered, usually by an engine and rudder. It is also known as a ZEPPELIN, which is an 8-letter word, or an AIRSHIP, which is a 7-letter word. A BLIMP is a type of dirigible, which is a 5-letter word. The dirigible is made up of a GAS-filled envelope, which is a 3-letter word, and a NACELLE, which is a 7-letter word. The NACELLE contains the engine, fuel, and crew, and is connected to the envelope by a keel, which is a 5-letter word. The dirigible is kept RIGID by a framework of metal girders called a capra, which is a 5-letter word. The dirigible is able to fly due to the lift created by the GAS in the envelope, which is a 5-letter word. Finally, a dirigible is also known as an aerostat, which is an 8-letter word.