You're relying on the dictionary definitions for "avoidance" and "evasion" to make your argument, but "tax avoidance" and "tax evasion" are industry-accepted terms with clearly differentiated meanings to describe different behavior. Tax avoidance tells a truth that takes advantage of legal loopholes, and is therefore legal not to pay a higher amount of taxes. Tax evasion attempts to commit fraud on legal paperwork in order to not pay taxes which are legally required to be paid. They are not the same thing.