Is a nonvolatile solute a vaporizing solute?

Probably yes. For example, ammonium chloride and iodine are both vaporizing solutes, but iodine is not volatile, whereas ammonium chloride is. So probably they are 2 different things. It probably is not necessary that a volatile solute is vaporizing too, like camphor, it is volatile, but it melts, does not form vapors directly