I want to post some “definitions” here.
Faculties are a priest’s authorization from the Church (usually through his bishop, or through the law itself) to administer the sacraments and the other spiritual goods of the Church.
Priests have ALL KINDS of different faculties. Faculties to say Mass. Faculties to hear confessions. Faculties to witness marriages. Faculties to dispense from the law. Faculties to perform blessings.
Each of these different kinds of faculties will depend on the individual assignment of that individual priest under those given circumstances. When a priest is transferred from one assignment to another, he might lose certain faculties and gain others.
Faculties (plural) are not a matter of “either-or” meaning that a priest either has faculties or he does not. Instead, a priest either has or has-not faculties for each and every individual function. By example, a priest might not have faculties for Confirmation, but he does have faculties to bless rosaries. A bishop might suspend a priest’s faculties to preach, but not suspend his faculties to say Mass.
A bishop can suspend ALL of a priest’s faculties or he can suspend only certain ones.
Faculties for some functions can be either permanent, or temporary, or even just for an individual act.
Likewise, sometimes a priest loses certain faculties for no reason other than a simple change of assignment. That change might even be a promotion!