Sound and valid are terms of art in deductive logic. They have clearly defined meanings.
Validity means the form of an argument is such that it's impossible for its premises to be true while the conclusion is false i.e. if the premises are true then the conclulsion must be true. Validity is a formal property of arguments and the relationships between premises. An argument can be valid even if its premises are false.
Soundness means that an argument is valid and that the premises are true (and therefore the conclusion must be true).
These are standard terms that have been used for over a century. You're going to generate a lot of confusion if you choose to use them differently to everyone who has ever studied elementary logic.
I'm not aware of these phrases being the same. I took mathematical logic in graduate school many years ago and I've used logically sound to be something different than sound argument.
I'm not disagreeing that valid would have been a better word choice. I did clarify my meaning in a subsequent post. I rewrote my point without using either sound or valid in an effort to be more precise.
Validity means the form of an argument is such that it's impossible for its premises to be true while the conclusion is false i.e. if the premises are true then the conclulsion must be true. Validity is a formal property of arguments and the relationships between premises. An argument can be valid even if its premises are false.
Soundness means that an argument is valid and that the premises are true (and therefore the conclusion must be true).
These are standard terms that have been used for over a century. You're going to generate a lot of confusion if you choose to use them differently to everyone who has ever studied elementary logic.