What is the explanation for the terms taxadvoice and tax evasion?

Tax Avoidance and Tax Evasion mean the same thing doing things to hide income and not reporting all of your worldwide income on your 1040 tax as you are required to do.

Go to the IRS gov website and use the search box forPublication 3995Recognizing Illegal Tax Avoidance Schemes

and use the search box for Employment Tax Evasion