reduction vs tax credit

reduction and tax credit both are nouns.

Word	Noun	Adjective	Verb	Adverb
reduction	Yes	No	No	No
tax credit	Yes	No	No	No

As nouns, tax credit is a hyponym of reduction; that is, tax credit is a word with a more specific, narrower meaning than reduction:

reduction: the act of decreasing or reducing something
tax credit: a direct reduction in tax liability (not dependent on the taxpayer's tax bracket)

reduction (noun)	tax credit (noun)
the act of decreasing or reducing something	a direct reduction in tax liability (not dependent on the taxpayer's tax bracket)
the act of reducing complexity
any process in which electrons are added to an atom or ion (as by removing oxygen or adding hydrogen); always occurs accompanied by oxidation of the reducing agent