imposition vs taxation

imposition and taxation both are nouns.

Word	Noun	Adjective	Verb	Adverb
imposition	Yes	No	No	No
taxation	Yes	No	No	No

As nouns, taxation is a hyponym of imposition; that is, taxation is a word with a more specific, narrower meaning than imposition:

imposition: the act of imposing something (as a tax or an embargo)
taxation: the imposition of taxes; the practice of the government in levying taxes on the subjects of a state

Other hyponyms of imposition include protection, trade protection, regimentation, reimposition.

imposition (noun)	taxation (noun)
the act of imposing something (as a tax or an embargo)	the imposition of taxes; the practice of the government in levying taxes on the subjects of a state
an uncalled-for burden	charge against a citizen's person or property or activity for the support of government
	government income due to taxation