[ggm]

Impost.

Duty. (like stamp duty)

Fee.

Licence/License. (maybe like the BBC licence fee?)

Levy. (see below)

There is also the concept of the hypothicated tax. The only exemplar I know is the Australian Medicare levy, the money is solely to be used, and spent on Medicare, and no other purpose enshrined in law. People often claim petrol tax was designed to pay for roads infrastructure but it wasn't legally bound, and is not a hypothicated tax. Nor is the ULEZ and like costs to drive in the inner city with a petrol engine. They are designed to discourage use of ICE not to pay for them.