Blimps are lighter-than-air vehicles used for transportation, surveillance, or advertising. The word 'blimp' has several synonyms with varied connotations. For instance, 'aerostats' and 'dirigibles' refer to airships, while 'balloons' and 'blowers' are commonly used in casual settings. 'Zeppelins' were initially military airships, and the word now primarily refers to a specific class of airship comprising of a rigid frame, while 'dirigibles' is a general term for controllable airships. In contrast, 'hot air balloons' use heated air to stay aloft and are often used recreationally. 'Inflatables' are often used to promote businesses or events, while 'airships' are often utilized for commercial purposes. Overall, these synonym choices reflect the specific use and technology behind these lighter-than-air vehicles.