First, you did not answer my question.
Second, using concepts in St. Thomas Aquinas commentary is important because the Church has based so much teaching on it.
In Scholastic terminology a distinction does not always mean separation nor its possibility. Of the supernatural soul the intellect and will are not separate. Freedom is a property of the whole human being rather than a component part and the will is not independent of the intellect. (Calvin, against Catholic teaching, separates the soul into two parts – intellect and will.)
Below, St. Thomas shows that the will and the free-will are not two powers, but one.
Summa Theologica Q83.
newadvent.org/summa/1083.htmI answer that, The appetitive powers must be proportionate to the apprehensive powers, as we have said above (Question 64, Article 2). Now, as on the part of the intellectual apprehension we have intellect and reason, so on the part of the intellectual appetite we have will, and free-will which is nothing else but the power of choice. And this is clear from their relations to their respective objects and acts. For the act of “understanding” implies the simple acceptation of something; whence we say that we understand first principles, which are known of themselves without any comparison. But to “reason,” properly speaking, is to come from one thing to the knowledge of another: wherefore, properly speaking, we reason about conclusions, which are known from the principles. In like manner on the part of the appetite to “will” implies the simple appetite for something: wherefore the will is said to regard the end, which is desired for itself. But to “choose” is to desire something for the sake of obtaining something else: wherefore, properly speaking, it regards the means to the end. Now, in matters of knowledge, the principles are related to the conclusion to which we assent on account of the principles: just as, in appetitive matters, the end is related to the means, which is desired on account of the end. Wherefore it is evident that as the intellect is to reason, so is the will to the power of choice, which is free-will. But it has been shown above (Question 79, Article 8) that it belongs to the same power both to understand and to reason, even as it belongs to the same power to be at rest and to be in movement. Wherefore it belongs also to the same power to will and to choose: and on this account the will and the free-will are not two powers, but one.