chariot
harma denotes a vehicle occupied, approached, or ordered to stop, and in one comparison evokes horse-drawn vehicles rushing toward war.
The attested uses denote a vehicle: in Acts it is the occupied vehicle that Philip is told to approach and that is ordered to stop, while Revelation uses plural vehicles in a comparison involving horses running toward war.
Senses in use
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A vehicle in travel and narrative action · dominant
In Acts 8:28, the genitive singular form occurs in the clause where a man is sitting in the vehicle while reading Isaiah; in Acts 8:29, the dative singular follows the command to go near and remain close to it. In Acts 8:38, the accusative singular is the vehicle ordered to stop before Philip and the eunuch go down into the water.
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Vehicles in a war-running comparison · rare
In Revelation 9:9, the genitive plural form occurs in a comparison: the APB renders the sound of wings as like many horse vehicles running toward war.
In the Anselm Project Bible: The APB consistently presents the singular Acts forms as "chariot" and the plural form in Revelation 9:9 as "horse chariots." These renderings confirm the verse contexts rather than isolate every contribution of the Greek form.