tax deduction vs tax write-off

tax deduction and tax write-off both are nouns.

Word	Noun	Adjective	Verb	Adverb
tax deduction	Yes	No	No	No
tax write-off	Yes	No	No	No

As nouns, tax deduction and tax write-off are synonyms defined as:

tax deduction and tax write-off: a reduction in the gross amount on which a tax is calculated; reduces taxes by the percentage fixed for the taxpayer's income bracket

Other synonyms of tax deduction include deduction.

tax deduction (noun)	tax write-off (noun)
a reduction in the gross amount on which a tax is calculated; reduces taxes by the percentage fixed for the taxpayer's income bracket	a reduction in the gross amount on which a tax is calculated; reduces taxes by the percentage fixed for the taxpayer's income bracket