请问tax与taxation有什么分别？

我觉得taxation更加倾向于名词，单指税制，不可数，例如：one principle of taxation.
而tax,名词，表示各种税种，更加具体，复数形式为taxes。

tax
verb

1: to assess or determine judicially the amount of (costs in a court action)
2: to levy a tax on
3: obsolete : to enter (a name) in a list
4: charge, accuse ; also : censure
5: to make onerous and rigorous demands on
tax
noun
: an amount of money that a government requires people to pay according to their income, the value of their property, etc., and that is used to pay for the things done by the government.

tax·a·tion
noun: the action, process, or system of taxing people or things