What's the difference between airship and dirigible?

Airship

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(1) Highlights include a stiffly worded letter from a gentleman complaining to the home secretary about the lack of sanitary towels for suffragettes in Holloway (while avoiding using the phrase “sanitary towels”) and a Daily Express article about Miss Muriel Matters who took to a dirigible to drop paper bills on parliament in return for their “dropping” of the women’s suffrage bills.
(2) Les dirigeants mondiaux qui se retrouvent à Paris, espèrent limiter la hausse de la température moyenne sur Terre à 2°C maximum – mais les analyses montrent que leurs engagements à réduire les émissions ne permettraient que d’en arriver à 3°C .
(3) Johann Carl George Fricke, the first "dirigating surgeon" of the newly erected General Hospital in Hamburg (1823) has taken up these suggestions and carried out similar investigations on two patients.
(4) He accused him of wasting money on crackpot schemes, including a suggestion that the city could use inflatable dirigible balloons to rescue swimmers who got into difficulties.
(5) High above the Philip Marlowe world, hover cars swoop and dirigible billboards float by.
(6) The last time Brazil experienced such a deep slump was in 1901, when soldiers were still fighting the last Indian war and aviator Santos Dumont was making a name for himself by flying around the Eiffel Tower in a dirigible.